Patent Grant
7435744
The present invention relates to carboxylic acid amide derivatives which are antagonists of NMDA receptors, intermediates and processing for preparing the same.
N-methyl-D-aspartate (NMDA) receptors are ligand-gated cation-channels embedded in the cell membranes of neurons. Overactivation of NMDA receptors by glutamate, their natural ligand, can lead to calcium overload of cells. This triggers a cascade of intracellular events that alters the cell function and ultimately may lead to death of neurons [TINS, 10, 299-302 (1987)]. Antagonists of the NMDA receptors may be used for treating many disorders that are accompanied with excess release of glutamate, the main excitatory neurotransmitter in the central nervous system.
The knowledge on the NMDA receptor structure, function and pharmacology has expanded owing to recent achievements of the molecular biology. The NMDA receptors are heteromeric assemblies built up from at least one NR1 subunit and at least one of the four different NR2 subunits (NR2A-D). Both spatial distributions in the CNS and the pharmacological sensitivity of NMDA receptors built up from various NR2 subunits are different. Particularly interesting of these is the NR2B subunit due to its restricted distribution (highest densities in the forebrain and substantia gelatinosa of the spinal cord). Compounds selective for this subtype are available [Curr. Pharm. Des., 5, 381-404 (1999)] and have been proved to be effective in animal models of stroke [Stroke, 28, 2244-2251 (1997)], traumatic brain injury [Brain Res., 792, 291-298 (1998)], Parkinson's disease [Exp. Neurol., 163, 239-243 (2000)], neuropathic and inflammatory pain [Neuropharmacology, 38, 611-623 (1999)]. Moreover, NR2B subtype selective antagonists of NMDA receptors are expected to possess little or no untoward side effects that are typically caused by the non-selective antagonists of NMDA receptors, namely psychotomimetic effects such as dizziness, headache, hallucinations, dysphoria and disturbances of cognitive and motor function.
NR2B subtype selective NMDA antagonism can be achieved with compounds that specifically bind to, and act on, an allosteric modulatory site of the NR2B subunit containing receptors. This binding site can be characterized by displacement (binding) studies with specific radioligands, such as [125I]-ifenprodil [J.Neurochem., 61, 120-126 (1993)] or [3H]-Ro 25,6981 [J. Neurochem., 70, 2147-2155 (1998)]. Since ifenprodil was the first, though not sufficiently specific, known ligand of this receptor, it has also been termed ifenprodil binding site.
Close structure analogs of the carboxylic acid amide derivatives of formula (I) are known from the literature. The Florida Center for Heterocyclic Compounds [Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Fla., 32611-7200] provides milligram quantities of three compounds of formula (I) for biological testing: N-(4-bromophenyl)-4-(phenylmethyl)-1-piperidineacetamide, 4-[[oxo[4-(phenylmethyl)-1-piperidinyl]acetyl]amino]benzoic acid and 4-[[oxo[4-(phenylmethyl)-1-piperidinyl]acetyl]amino]benzoic acid ethyl ester.
Oxo-ethylamino derivatives are described as intermediates for thrombin inhibitors [Bioorg. Med. Chem. Letters, 9, 925. (1999)]. The publication does not describe NMDA receptor antagonist effect.
N-(4-Benzoylphenyl)-4-(phenylmethyl)-1-piperidineacetamide is mentioned in U.S. Pat. No. 6,048,900 as selective neuropeptide Y receptor antagonist.
N-(2-Formyl-6-methylphenyl)-4-(phenylmethyl-1-piperidineacetamide is described in Australian patent application No. AU 639529 as an intermediate for carbostyril derivative which is useful as antiarrhythmics.
Aminoacetarylides are also known [Rev. Chim. (Bucharest), 33(7), 601. (1982); CA 97:174467a] as local anesthetic and antifibrillatory agents.
Piperidine derivatives and analogues substituted with phenols or phenol equivalents having NR2B selective NMDA antagonist activity are described in international patent application nos. WO 90/14087, WO 90/14088, WO 97/23202, WO 97/23214, WO 97/23215, WO 97/23216, WO 97/23458, WO 99/21539, WO 00/25109, European patent application No. EP 648744 A1 and in U.S. Pat. No. 5,436,255. Compounds containing 2-benzoxazolinone substructure with the same biological activity are described in international patent applications WO 98/18793 and WO 00/00197. Other NR2B selective NMDA antagonists having condensed heterocyclic structures are described in international patent application nos. WO 01/30330, WO 01/32171, WO 01/32174, WO 01/32177, WO 01/32179, 01/32615, WO 01/32634.
However, there continues to be a need for novel NMDA antagonists that target the NR2B receptor.
Carboxylic acid amide derivatives of formula (I)
are functional antagonists of NMDA receptors, which target the NMDA receptors primarily via binding to the ifenprodil binding site and are, thus, believed to be NR2B subtype specific antagonists.
The present invention relates therefore first to carboxylic acid amide derivatives of formula (I):
wherein
Further objects of the present invention are the pharmaceutical compositions containing carboxylic acid amide compounds of formula (I) or optical antipodes or racemates or the salts thereof as active ingredients.
A further object of the invention are the processes for producing of carboxylic acid amide compounds of formula (I), and the pharmaceutical manufacture of medicaments containing these compounds, as well as the process of treatments with these compounds, which means administering to a mammal to be treated—including human—effective amount/amounts of compounds of formula (I) of the present invention or as a medicament.
The carboxylic acid amide derivatives of formula (I) of the present invention are highly effective and selective antagonists of NMDA receptor, and moreover most of the compounds are selective antagonist of NR2B subtype of NMDA receptor.
According to the invention the carboxylic acid amide compounds of formula (I) can be prepared by the following processes:
The amide bond formation is preferably carried out by preparing an active derivative from a carboxylic acid of formula (II) or (IV) which is reacted with an amine of formula (III) or (V) preferably in the presence of a base.
The transformation of a carboxylic acid into an active derivative can be carried out in situ during the amide bond formation in a proper solvent (for example dimethylformamide, acetonitrile, chlorinated hydrocarbons or hydrocarbons). The active derivatives can be acid chlorides (for example prepared from carboxylic acid with thionyl chloride), mixed anhydrides (for example prepared from carboxylic acid with isobutyl chloroformate in the presence of a base, e.g., triethylamine), active esters (for example prepared from carboxylic acid with hydroxybenztriazol and dicyclohexyl-carbodiimide or O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HBTU) in the presence of a base, e.g., triethylamine), acid azides (for example prepared from carboxylic acid hydrazide). The active derivatives can be prepared between room temperature and 0° C. A proper amine of formula (III) or (V) is added as base or as a salt formed with inorganic acid to the so obtained solution or suspension in the presence of a base, for example triethylamine, needed for the liberation of the amine. The condensation reactions are followed by thin layer chromatography. The necessary reaction time is 6-20 hours. The work-up of the reaction mixture can be carried out by different methods.
The amide bond formation is preferably carried out by refluxing in a proper solvent an amine of formula (III) or (V) with a halogen compound of formula (IV) or (VII) in the presence of an organic base (e.g., triethylamine, pyridine, piperidine) or an inorganic base (e.g., sodium carbonate or potassium carbonate) and sodium iodide. The proper solvent can be an aprotic solvent (e.g., toluene, chlorinated hydrocarbons) or a dipolar aprotic solvent (e.g., ketone, acetonitrile or dimethylformamide). The reactions are followed by thin layer chromatography. The necessary reaction time is 20-50 hours. The work-up of the reaction mixture also can be carried out by different methods.
When the reaction mixture is a suspension, the precipitate is filtered off, washed with water and/or with an organic solvent and recrystallized from a proper solvent to give the pure product. If the crystallization does not lead to the pure product, then column chromatography can be used for the purification of it. The column chromatography is carried out on normal phase using Kieselgel 60 as adsorbent and different solvent systems, e.g., toluene/methanol, chloroform/methanol or toluene/acetone, as eluents. If the reaction mixture is a solution at the end of the acylation or alkylation, it is concentrated, and the residue is crystallized or purified by column chromatography as described above. The structure of the products are determined by IR, NMR and mass spectrometry.
The obtained carboxylic acid amide derivatives of formula (I)—independently from the method of preparation—in given case can be transformed into an other compound of formula (I) by introducing further substituents and/or modifying and/or removing the existing ones, and/or formation of salts with acids and/or liberating the carboxylic acid amide derivative of formula (I) from the obtained acid addition salts by treatment with a base and/or the free carboxylic acid amide derivative of formula (I) can be transformed into a salt by treatment with a base.
For example cleaving the methyl and benzyl groups from methoxy and benzyloxy groups, which stands for U, V and Z, leads to phenol derivatives. The removal of the benzyl group can be carried out for example with catalytic hydrogenation or with hydrogen bromide in acetic acid solution, the cleavage of methyl group can be carried out with boron tribromide in dichloromethane solution. The compounds of formula (I) containing free phenolic hydroxy group can be transformed into acyloxy or sulfoxy derivatives with different acylating or sulfonylating agents. The reactions are carried out at room temperature in chlorinated hydrocarbons using acid chloride or acid anhydride as acylating agent in the presence of a base (e.g., triethylamine or sodium carbonate). The carboxylic acid amide derivatives of formula (I) containing a nitro group (I) can be transformed into amines by catalytic hydrogenation and the amines can be further reacted to give acid amides as described for the acylation of phenolic hydroxy groups. Free hydroxy groups can be esterified by acid anhydrides or acid halogenides in the presence of a base.
The carboxylic acids of formula (II) or (IV), the primary or secondary amines of formula (III) or (V) and the halogene compounds of formula (VI) or (VII) are either commercially available or can be synthesized by different known methods. The syntheses of some commercially not available carboxylic acids of formula (II) or (IV) or halogen compounds of (VI) or (VII) are described in the Examples. Following these procedures the other commercially not available carboxylic acids of formula (II) or (IV) or halogen compounds of formula (VI) or (VII) can also be prepared.
It is known that during postnatal development the subunit composition of neuronal NMDA receptors is changing. Similar change has been detected in neuronal cell cultures [Eur. J. Neurosci., 10, 1704-1715 (1998)]. According to data in the literature and to our own immunocytochemical examinations neuronal cells cultured for 4-7 days in vitro predominantly express the NR2B subunit, together with NR1 subunit. Therefore, functional test of NMDA antagonism in these cells reflects mainly an action on NR2B subunit containing receptors. Since NMDA receptors are known to be permeable to calcium ions upon excitation, the extent of NMDA receptor activation, and its inhibition by functional antagonists can be characterised by measuring the rise in the intracellular calcium concentration following agonist (NMDA) application onto the cells. Since there is very high sequence homology between rat and human NMDA receptors (99, 95, 97% for NR1, NR2A, and NR2B subunits, respectively), it is believed that there is little, if any, difference in their pharmacological sensitivity. Hence, results obtained with (cloned or native) rat NMDA receptors may be well extrapolated to the human ones.
The intracellular calcium measurements are carried out on primary neocortical cell cultures derived from 17 day old Charles River rat embryos [for the details on the preparation of neocortical cell culture see Johnson, M. I.; Bunge, R. P. (1992): Primary cell cultures of peripheral and central neurons and glia. In: Protocols for Neural Cell Culture, eds: Fedoroff, S.; Richardson A., The Humana Press Inc., 13-38.] After isolation, the cells are plated onto standard 96-well microplates and the cultures are maintained in an atmosphere of 95% air-5% CO2 at 37° C. until testing.
The cultures are used for the intracellular calcium measurements after 4-7 days in vitro. The cells are loaded with a fluorescent Ca2+-sensitive dye, Fluo-4/AM (2-2.5 μM) prior to testing. Loading is stopped by washing twice with the solution used also during the measurement (140 mM NaCl, 5 mM KCl, 2 mM CaCl2, 5 mM HEPES [4-(2-hydroxyethyl)-1-piperazineethane-sulfonic acid], 5 mM HEPES-Na, 20 mM glucose, 10 μM glycine, pH=7.4). Then the test compound dissolved in the above solution (90 μl/well) is added. Intracellular calcium measurements are carried out with a plate reader fluorimeter. A rise is induced by application of 40 μM NMDA in Fluo-4-fluorescence that reflects the intracellular calcium concentration. Inhibitory potency of the test compound is assessed by measuring the reduction in the calcium elevation in the presence of different concentrations of the compound. After the measurement, a standard calibration procedure [Meth. Cell. Biol., 40, 155-181 (1994)] is applied to convert the fluorescence data to calcium concentration values.
Inhibitory potency of a compound at a single concentration point is expressed as percent inhibition of the control NMDA response. Sigmoidal concentration-inhibition curves are fitted over the data and IC50 values are defined as the concentration that produces half of the maximal inhibition that could be achieved with the compound. Mean IC50 values are derived from at least three independent experiments.
The method for determining the binding of compounds to NR2B subunit by [3H]-Ro 25,6981 binding assay is essentially similar to that described by Mutel et al. [J. Neurochem., 70, 2147-2155 (1998)] except for incubation temperature and radioligand concentration. Briefly, membranes are isolated from the forebrain of male Wistar rats. They are incubated in the presence and absence of test compound for 2 hours at room temperature. Non-specific binding is determined using 10 μM Ro-25,6981, and is typically less than 7% of the total binding. The applied radioligand (3H-Ro-25,6981) concentration is 4 nM. IC50 values (50% inhibitory concentrations) are determined from sigmoidal fits plotted over concentration-displacement curves.
IC50 values for selected examples of compounds of this invention in the functional NMDA antagonism and in the binding tests are listed in Table 1 and compared to those determined for the most potent known reference compounds.
The compounds of this invention exhibit IC50 values of less than 50 μM in the functional NMDA antagonism and in the binding tests. Thus the compounds and pharmaceutical compositions of this invention are NR2B subtype specific .NMDA antagonists. Some of the compounds have superior potency compared to the known reference compounds (see Table 1).
wherein for NMDA IC50—IC50 is determined by the intracellular Ca2+-concentartion assay on cortical neurons; and for Ro-binding IC50—IC50 is determined by the [3H]-Ro 25,6981 binding assay on rat cerebral membranes.
The reference compounds of Table 1 are as follows:
Injection of diluted formalin into the hind paw of rats or mouse is known to elicit a biphasic pain related behaviour measured as time spent by licking/biting of the injured paw. The second phase is generally defined as pain related events detected in the 15-60 min. time interval after formalin injection. It is known that NMDA receptors are involved in the second phase of response to formalin injection and this behavioural response is sensitive to blockade of NMDA receptors [Dickenson, A. and Besson J.-M. (Eds.): Chapter 1, pp. 6-7: Animal models of Analgesia; and Chapter 8, pp. 180-183: Mechanism of Central Hypersensitivity: Excitatory Amino Acid Mechanisms and Their Control—In Pharmacology of Pain. Springer-Verlag (Berlin) 1997.] Therefore, we performed the second phase of formalin test to characterise the efficacy of compounds in vivo. Inhibition of the second phase of response is considered to indicate an analgesic effect against chemically-induced persistent pain [Hunskaar, S., et al.: Formalin Test in Mice, a Useful Technique for Evaluating Mild Analgesics, Journal of Neuroscience Methods, 14 (1985) 69-76.] Male albino Charles River NMRI mice (20-25 g) were used. Prior to the experiment any solid food was withdrawn for 16 hours but the animals had free access to 20% glucose solution. The animals were allowed a 1 hour acclimatisation period spent in a glass cylinder (cc. 15 cm in diameter), then moved to an identical cylinder with a mirror placed behind to facilitate observation. The test substances were suspended in 5% tween-80 (10 ml per kg body weight). and administered orally by gavage 15 min before the formalin injection (20 μl of 1% formalin in 0.9% saline injected subcutaneously into the dorsal surface of the right hindpaw). The time spent by licking and biting of the injected paw was measured from 20 to 25 min. after the formalin injection. For the determination of ED50 value, various doses (at least five) of the test substances were given to groups of 5 mice and the results expressed as % inhibition time spent by licking relative to a vehicle control group observed on the same day. ED50 values (i.e., the dose yielding 50% inhibition) were calculated by Boltzman's sigmoidal curve fitting.
Disorders which may be beneficially treated with NMDA antagonists include traumatic injury of brain [Neurol. Res., 21, 330-338 (1999)] or spinal cord [Eur. J. Pharmacol., 175, 165-74 (1990)], human immunodeficiency virus (HIV) related neuronal injury [Annu. Rev. Pharmacol. Toxicol., 1998; 38159-77], amyotrophic lateral sclerosis [Neurol. Res., 21, 309-12 (1999)], tolerance and/or dependence to opioid treatment of pain [Brain. Res., 731, 171-181 (1996)], withdrawal syndromes of e.g., alcohol, opioids or cocaine [Drug and Alcohol Depend., 59, 1-15 (2000)], muscular spasm [Neurosci. Lett., 73, 143-148 (1987)], dementia of various origins [Expert Opin. Investig. Drugs, 9, 1397-406 (2000)]. An NMDA antagonist may also be useful to treat cerebral ischemia of any origin (e.g., stroke, heart surgery), chronic neurodegenerative disorders, such as Alzheimer's disease, Parkinson's disease, Huntington's disease, pain (e.g., posttraumatic or postoperative) and chronic pain states, such as neuropathic pain or cancer related pain, epilepsy, anxiety, depression, migraine, psychosis, hypoglycemia, degenerative disorders of the retina (e.g., CMV retinitis), glaucoma, asthma, tinnitus, aminoglycoside antibiotic-induced hearing loss [Drug News Perspect 11, 523-569 (1998) and WO 00/00197 international patent application].
Accordingly, effective amounts of the compounds of the invention may be beneficially used for the treatment of traumatic injury of brain or spinal cord, human immunodeficiency virus (HIV) related neuronal injury, amyotrophic lateral sclerosis, tolerance and/or dependence to opioid treatment of pain, withdrawal syndromes of e.g., alcohol, opioids or cocaine, ischemic CNS disorders, chronic neurodegenerative disorders, such as Alzheimer's disease, Parkinson's disease, Huntington's disease, pain and chronic pain states, such as neuropathic pain or cancer related pain, epilepsy, anxiety, depression, migraine, psychosis, muscular spasm, dementia of various origin, hypoglycemia, degenerative disorders of the retina, glaucoma, asthma, tinnitus, aminoglycoside antibiotic-induced hearing loss.
The compounds of the invention as well as their pharmaceutically acceptable salts can be used as such or suitably in the form of pharmaceutical compositions. These compositions (drugs) can be in solid, liquid or semiliquid form and pharmaceutical adjuvant and auxiliary materials can be added, which are commonly used in practice, such as carriers, excipients, diluents, stabilizers, wetting or emulsifying agents, pH- and osmotic pressure-influencing, flavoring or aromatizing, as well as formulation-promoting or formulation-providing additives.
The dosage required to exert the therapeutical effect can vary within wide limits and will be fitted to the individual requirements in each of the particular cases, depending on the stage of the disease, the condition and the bodyweight of the patient to be treated, as well as the sensitivity of the patient against the active ingredient, route of administration and number of daily treatments. The actual dose of the active ingredient to be used can safely be determined by the attending physician skilled in the art in the knowledge of the patient to be treated.
The pharmaceutical compositions containing the active ingredient according to the present invention usually contain 0.01 to 100 mg of active ingredient in a single dosage unit. It is, of course possible that the amount of the active ingredient in some compositions exceeds the upper or lower limits defined above.
The solid forms of the pharmaceutical compositions can be for example tablets, dragées, capsules, pills or lyophilized powder ampoules useful for the preparation of injections. Liquid compositions are the injectable and infusable compositions, fluid medicines, packing fluids and drops. Semiliquid compositions can be ointments, balsams, creams, shaking mixtures and suppositories.
For the sake of a simple administration it is suitable if the pharmaceutical compositions comprise dosage units containing the amount of the active ingredient to be administered once, or a few multiples or a half, third or fourth part thereof. Such dosage units are e.g., tablets, which can be powdered with grooves promoting the halving or quartering of the tablet in order to exactly administer the required amount of the active ingredient.
Tablets can be coated with an acid-soluble layer in order to assure the release of the active ingredient content after leaving the stomach. Such tablets are enteric-coated. A similar effect can be achieved also by encapsulating the active ingredient.
The pharmaceutical compositions for oral administration can contain, for example, lactose or starch as excipients, sodium carboxymethylcellulose, methylcellulose, polyvinyl pyrrolidine or starch paste as binders or granulating agents. Potato starch or microcrystalline cellulose is added as disintegration agents, but ultraamylopectin or formaldehyde casein can also be used. Talcum, colloidic silicic acid, stearin, calcium or magnesium stearate can be used as antiadhesive and lubricants.
The tablet can be manufactured for example by wet granulation, followed by pressing. The mixed active ingredients and excipients, as well as in given case part of the disintegrants are granulated with an aqueous, alcoholic or aqueous alcoholic solution of the binders in an appropriate equipment, then the granulate is dried. The other disintegrants, lubricants and antiadhesive agents are added to the dried granulate, and the mixture is pressed to a tablet. In given case the tablets are made with halving groove to ease the administration.
The tablets can be made directly from the mixture of the active ingredient and the proper auxiliaries by pressing. In given case, the tablets can be coated by using additives commonly used in the pharmaceutical practice, for example stabilizers, flavoring, coloring agents, such as sugar, cellulose derivatives (e.g., methyl- or ethylcellulose, sodium carboxymethylcellulose, etc), polyvinyl pyrrolidone, calcium phosphate, calcium carbonate, food coloring agents, food laces, aroma agents, iron oxide pigments, etc. In the case of capsules the mixture of the active ingredient and the auxiliaries is filled into capsules.
Liquid oral compositions, for example suspensions, syrups, elixirs can be made by using water, glycols, oils, alcohols, coloring and flavoring agents.
For rectal administration the composition is formulated in suppositories or clysters. The suppository can contain beside the active ingredient a carrier, so called adeps pro suppository. Carriers can be vegetable oils, such as hydrogenated vegetable oils, triglycerides of C12-C18 fatty acids (preferably the carriers under the trade name Witepsol). The active ingredient is homogeneously mixed with the melted adeps pro suppository and the suppositories are moulded.
For parenteral administration the composition is formulated as injection solution. For manufacturing the injection solution the active ingredients are dissolved in distilled water and/or in different organic solvents, such as glycolethers, in given case in the presence of solubilizers, for example polioxyethylensorbitane-monolaurate, -monooleate, or monostearate (Tween 20, Tween 60, Tween 80). The injection solution can also contain different auxiliaries, such as conserving agents, for example ethylendiamine tetraacetate, as well as pH adjusting agents and buffers and in given case local anaesthetic, e.g., lidocain. The injection solution containing the active ingredient of the invention is filtered before it is filled into ampoules, and it is sterilized after filling.
If the active ingredient is hygroscopic, then it can be stabilized by liophylization.
The following examples illustrate the invention without intending to limit the scope of the invention.
To a stirred solution of 2.3 g (10 mmol) of 4-(4-fluoro-benzyl)-piperidine hydrochloride [J. Med. Chem., 35, 4903. (1992)] and 4.5 ml (32 mmol) of triethylamine in 80 ml of chloroform 2.5 ml (22 mmol) of ethyl oxalyl chloride in 20 ml of chloroform is added dropwise below 10° C., and the reaction mixture is stirred at room temperature for 10 hours. Then 50 ml of 8% sodium hydrogen carbonate solution is added to the mixture, the organic layer is separated and the water phase is extracted three times with 25 ml of chloroform. The combined organic layers are dried over sodium sulfate, concentrated, the residue is treated with diisopropyl ether and the crystals are filtered to yield 2.1 g (72%) of the title compound. Melting Point: 72-74° C. (diisopropyl ether)
To a stirred solution of 1.91 g (6.5 mmol) of [(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic-acid ethyl ester in 15 ml of ethanol is added a solution of 1.18 g (21.1 mmol) of potassium hydroxide in 3 ml of water. The reaction mixture is stirred at room temperature for 6 hours then cooled and acidified with hydrochloric acid. The solid is collected, washed with water to yield 1.68. (97.4%) g of the title compound. Melting Point: 152-154° C. (ethanol-water)
A mixture of 3.2 g (12 mmol) of [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid, 1.4 ml (10 mmol) of triethylamine, 1.5 g (10 mmol) of 5-amino-1,3-dihydro-indol-2-one [Tetrahedron, 24, 1376. (1957)] 3.8 g (10 mmol) of HBTU [O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium hexafluorophosphate (Advanced Chem. Tech.)] and 100 ml of dimethylformamide is stirred at room temperature for 24 hours. The reaction mixture is concentrated. Then 150 ml of 8% sodium hydrogencarbonate solution and 150 ml of chloroform is added to the mixture. The organic layer is separated and the water phase is extracted three times with 25 ml of chloroform. The combined organic layers are dried over sodium sulfate, concentrated and the residue is purified by column chromatography using Kieselgel 60 as adsorbent (Merck) and chloroform:methanol=19:1 as eluent to yield 2.67 g (68%) of the title compound. Melting Point: 195-197° C. (diethylether)
A mixture of 2.5 g (9.6 mmol) of [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b), 1.1 ml (8 mmol) of triethylamine, 1.2 g (8 mmol) of 5-amino-1,3-dihydro-benzimidazol-2-one [J. Amer. Chem. Soc., 80, 1657. (1958)] 3.03 g (8 mmol) of HBTU and 80 ml of dimethylformamide is stirred at room temperature for 24 hours. The reaction mixture is concentrated, then 100 ml of 8% sodium hydrogencarbonate solution is added. The precipitated product is filtered off and recrystallized from methanol to yield 1.51 g (48%) of the title compound. Melting Point: >260° C. (methanol)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 6-amino-3H-benzoxazol-2-one [J. Chem. Soc.,321. (1938)] according to the method described in Example 1c. Melting Point: 224-227° C. (diethylether)
The title compound is prepared from 5-amino-3H-benzoxazol-2-one [J. Med. Chem., 10, 408. (1967)] and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) according to the method described in Example 2. Melting Point: 226-231° C. (water)
The title compound is prepared from 4-benzyl-piperidine (Aldrich) and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: oil
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: 109-112° C. (ethanol-water)
The title compound is prepared from 4-amino-benzonitrile (Aldrich) and (4-benzyl-piperidin-1-yl)-oxo-acetic acid according to the method described in Example 2. Melting Point: 166-169° C. (diethylether)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 5-amino-1,3-dihydro-indol-2-one according to the method described in Example 2. Melting Point: 115-118° C. (water)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 5-amino-1,3-dihydro-benzimidazol-2-one according to the method described in Example 2. Melting Point: >260° C. (water)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 6-amino-3H-benzoxazol-2-one according to the method described in Example 1c. Melting Point: 190-193° C. (diethylether)
The title compound is prepared from 4-amino-benzonitrile and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) according to the method described in Example 1c. Melting Point: 167-169° C. (diethylether)
The title compound is prepared from N-(3-nitro-phenyl)-oxalamic acid ethyl ester [J.Chem. Soc., 121, 1501. (1922)] according to the method described in Example 1b. Melting Point: >270° C. (ethanol-water)
The title compound is prepared from N-(3-nitro-phenyl)-oxalamic acid and 4-benzyl-piperidine according to the method described in Example 1c. Melting Point: 138-140° C. (diethylether)
A mixture of 1.8 g (4.9 mmol) of 2-(4-benzyl-piperidin-1-yl)-N-(3-nitro-phenyl)-2-oxo-acetamide(Example 10b), 50 ml of dimethylformamide, 0.5 g of 10% Pd/C catalyst is hydrogenated for 2 hours. The catalyst is filtered off, washed with dimethylformamide and the filtrate is concentrated. The residue is treated with diethylether and the precipitated crystals are filtered off to yield 1.41 g (83% ) of the title compound. Melting Point: 103-105° C. (diethylether)
To a stirred solution of 0.34 g (1 mmol) of N-(3-amino-phenyl)-2-(4-benzyl-piperidin-1-yl)-2-oxo-acetamide (Example 11) and 0.16 ml (2 mmol) of pyridine in 10 ml of dichloromethane 0.16 ml (2 mmol) of methanesulfonyl chloride in 2 ml of dichloromethane is added dropwise below 10° C., and the reaction mixture is stirred at room temperature for 10 hours. Then 50 ml of 8% sodium hydrogencarbonate solution is added to the mixture, the organic layer is separated and the water phase is extracted three times with 10 ml of dichloromethane. The combined organic layers are dried over sodium sulfate, concentrated, the residue is treated with diethylether and the crystals are filtered to yield 0.25 g (30%) of the title compound. Melting Point: 128-130° C. (diethylether)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 3-aminophenol (Aldrich) according to the method described in Example 2. Melting Point: 158-160° C. (water)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 3-aminobenzonitrile (Aldrich) according to the method described in Example 1c. Melting Point: 135-138° C. (diethylether)
The title compound is prepared from 4-(4-fluoro-benzyl)-piperidine and N-(3-nitro-phenyl)-oxalamic acid (Example 10a according to the method described in Example 2. Melting Point: 135-138° C. (diethylether)
The title compound is prepared from 2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-N-(3-nitro-phenyl)-2-oxo-acetamide (Example 15) according to the method described in Example 11. Melting Point: 117-120° C. (diethylether)
The title compound is prepared from N-(3-amino-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxo-acetamide (Example 16) according to the method described in Example 12. Melting Point: 102-106° C. (diethylether)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 4-aminophenol (Aldrich) according to the method described in Example 1c. Melting Point: 167-169° C. (diethylether).
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and N-(4-amino-phenyl)-methanesulfonamide [Tetrahedron, 42, 5739. (1986)] according to the method described in Example 2. Melting Point: 221-225° C. (water)
The title compound is prepared from 5-aminoindazol (Aldrich) and (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) according to the method described in Example 1c Melting Point: 204-209° C. (diethylether)
The title compound is prepared from 5-aminoindazol (Aldrich) and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) according to the method described in Example 2. Melting Point: 198-200° C. (diethylether)
The title compound is prepared from 7-amino-4H-benzo[1,4]oxazin-3-one [J. Med. Chem., 32, 1627. (1989)] and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) according to the method described in Example 2. Melting Point: 209-212° C. (diethylether)
The title compound is prepared from (1H-benzimidazol-5yl) amine [Synth. Commun., 29, 2435. (1999)] and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid Example 1b) according to the method described in Example 1c. Melting Point: 104-110° C. (diethylether)
The title compound is prepared from 7-amino-4H-benzo[1,4]oxazin-3-one and (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) according to the method described in Example 2. Melting Point: 123-126° C. (diethylether)
The title compound is prepared from 6-aminoindazol (Aldrich) and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) according to the method described in Example 2. Melting Point: 162-164° C. (diethylether)
The title compound is prepared from 4-p-tolyloxy-piperidine [J. Med. Chem., 21, 309. (1978)] and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: oil.
The title compound is prepared from oxo-(4-p-tolyloxy-piperidin-1-yl)-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: 109-112° C. (ethanol-water).
The title compound is prepared from oxo-(4-p-tolyloxy-piperidin-1-yl)-acetic acid and 5-amino-1,3-dihydro-indol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 176-178° C. (diethyl ether)
The title compound is prepared from 4-(4-fluoro-phenoxy)-piperidine (U.S. Pat. No. 3,260,723) and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: oil
The title compound is prepared from [4-(4-fluoro-phenoxy)-piperidin-1-yl]-oxo-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: 147-149° C. (ethanol-water)
The title compound is prepared from [4-(4-fluoro-phenoxy)-piperidin-1-yl]-oxo-acetic acid and 5-amino-1,3-dihydro-indol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 209-211° C. (diethyl ether)
The title compound is prepared from 4-phenoxy-piperidine (J. Med. Chem., 17, 1000. (1974)] and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: oil.
The title compound is prepared from oxo-(4-phenoxy-piperidin-1-yl)-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: 109-112° C. (ethanol-water).
The title compound is prepared from oxo-(4-phenoxy-piperidin-1-yl)-acetic acid and 5-amino-1,3-dihydro-indol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 78-81° C. (diethyl ether)
Under argon, to a stirred solution 10.0 g (49.7 mmol) of4-hydroxy-piperidin-1-carboxylic acid tert-butyl ester [Bioorg. Med. Chem. Lett. 10, 2815. (2000)] in 80 ml of dimethylformamide 3.0 g (60%, 75 mmol) of sodium hydride is added. The reaction mixture is stirred for 1 hour at 40° C., then 5.3 ml (49.7 mmol) of 1-chloro-4-fluoro-benzene (Aldrich) in 20 ml dimethylformamide is added dropwise at 20° C. The reaction mixture is stirred for 4 hours at 80° C., cooled to 20° C., 1 ml of ethanol is added dropwise, poured into 100 ml of water and extracted with ethyl acetate. The organic layer is dried over sodium sulfate and concentrated. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and ethyl acetate as eluent to yield 11.07 g (75.5%) of the title compound. Melting Point: oil
To a solution of 150 ml of 2.5 M hydrochloric acid in ethyl acetate 11.07 g (37.5 mmol) of 4-(4-chloro-phenoxy)-piperidin-1-carboxylic acid tert-butyl ester is added. The reaction mixture is stirred for 3 hours at 20° C., then concentrated to 50 ml. The precipitated crystals are filtered off, washed with ethyl acetate to yield 7.0 g (75.2%) of the title compound. Melting Point: 194-196° C.
The title compound is prepared from 4-(4-chloro-phenoxy)-piperidine and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: oil.
The title compound is prepared from [4-(4-fluoro-phenoxy)-piperidin-1-yl]-oxo-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: 144-145° C. (ethanol-water)
The title compound is prepared from [4-(4-chloro-phenoxy)-piperidin-1-yl]-oxo-acetic acid and 5-amino-1,3-dihydro-indol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 198-200° C. (diethyl ether)
The title compound is prepared from [4-(4-chloro-phenoxy)-piperidin-1-yl]-oxo-acetic acid (Example 29d) and 5-amino-1,3-dihydro-benzimidazol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and chloroform:methanol=10:1 as eluent. Melting Point: 286-288° C. (isopropanol)
The title compound is prepared from [4-(4-chloro-phenoxy)-piperidin-1-yl]-oxo-acetic acid (Example 29d) and 6-amino-3H-benzoxazol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 242-244° C. (isopropanol)
To a stirred solution of 0.3 g (1.8 mmol) of 6-amino-3H-benzoxazole-2-thione [J. Org. Chem., 19; 758. (1954)] and 0.6 ml (4.3 mmol) of triethylamine in 20 ml of chloroform 0.5 g (1.8 mmol) of (4-benzyl-piperidine-1-yl)-oxo-acetyl chloride (Example 38c) in 10 ml of chloroform is added dropwise at 0° C. The reaction mixture is stirred at room temperature for 1 hour, then washed with water and the organic layer is concentrated. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent to yield 0.46 g (61.9%) of the title compound. Melting Point: 203° C. (isopropanol)
The title compound is prepared from 4-(4-chloro-benzyl)-piperidine (C.A.77, 34266 w) and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: oil
The title compound is prepared from [4-(4-chloro-benzyl)-piperidin-1-yl]-oxo-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: 147-148° C. (ethanol-water).
The title compound is prepared from [4-(4-chloro-benzyl)-piperidin-1-yl]-oxo-acetic acid and 6-amino-3H-benzoxazol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 215° C. (isopropanol)
The title compound is prepared from [4-(4-chloro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 33b) and 5-amino-1,3-dihydro-benzimidazol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 299-300° C. (isopropanol)
The title compound is prepared from oxo-(4-p-tolyloxy-piperidin-1-yl)-acetic acid (Example 26b) and 6-amino-3H-benzoxazol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 203° C. (isopropanol)
The title compound is prepared from oxo-(4-p-tolyloxy-piperidin-1-yl)-acetic acid (Example 26b) and 5-amino-1,3-dihydro-benzimidazol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 294° C. (isopropanol)
The title compound is prepared from [4-(4-chloro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 33b) and 5-amino-1,3-dihydro-indol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 195° C. (isopropanol-diethyl ether)
A mixture of 10.0 g (61.0 mmol) of 5-nitro-2,3-dihydro-1H-indole (Aldrich), 100 ml of dichloromethane, 16.5 g (94.8 mmol) of di-tert-butyl dicarbonate, 13.2 ml (94.8 mmol) of trietylamine and 0.2 g (1.6 mmol) of 4-(dimethylamino)-pyridine is stirred at room temperature for 16 hours. The reaction mixture is washed with water, dried over sodium sulfate and concentrated to yield 15.3 g (99.5%) of the title compound. The crude product is used in the next step.
A mixture of 15.3 g (60.7 mmol) of 5-nitro-2,3-dihydro-indol-1-carboxylic acid tert-butyl ester, 200 ml of methanol, 200 ml of tetrahydrofuran and 1 g of 10% Pd/C catalyst is hydrogenated. After completion of the reaction, the catalyst is filtered off, washed with tetrahydrofuran and the filtrate is concentrated. The residue is treated with a mixture of diisopropyl ether and hexane and the precipitated crystals are filtered off to yield 12.2 g (90.5%) of the title compound. Melting Point: 75-76° C. (isopropyl ether-hexane)
A mixture of 28.78 g (116.3 mmol) of (4-benzyl-piperidin-1-yl)-oxo-acetic acid_(Example 5b) and 50 ml of thionyl chloride is refluxed for 2 hours. The reaction mixture is concentrated to yield 30.5 g (98.6%) of the title compound as a solid. The crude products is used in the next step.
To a stirred solution of 0.5 g (2.25 mmol) of 5-amino-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester and 0.4 ml (2.8 mmol) of triethylamine in 20 ml of chloroform 0.7 g (2.6 mmol) of (4-benzyl-piperidin-1-yl)-oxo-acetyl chloride in 10 ml of chloroform is added dropwise at 0° C. The reaction mixture is stirred at room temperature for 1 hour, then washed with water and the organic layer is concentrated. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent to yield 0.9 g (88.7%) of the title compound as solid. The crude product is used in the next step.
To a solution of 10 ml of 2.5 M hydrochloric acid in ethyl acetate 0.9 g (2.0 mmol) of 5-[2-(4-benzyl-piperidin-1-yl)-2-oxo-acetylamino]-2,3-dihydro-indol-1-carboxylic acid tert-butyl ester is added. The reaction mixture is stirred for 3 hours at 20° C., then concentrated. The product is transformed into base form with 2 M sodium carbonate solution, extracted with chloroform, the organic layer is concentrated and the residue is dried to yield 0.45 g (64.1%) of the title compound. Melting Point: 152° C.
A mixture of 11.86 g (39.4 mmol) of 5-nitro-1(3)H-benzimidazol-2-ylamine nitrate (U.S. Pat. No. 2,324,123), 150 ml of dichloromethane, 11.0 g (50.4 mmol) of di-tert-butyl dicarbonate and 14.0 ml (100.6 mmol) of trietylamine is stirred at room temperature for 16 hours. The reaction mixture is washed with water, dried over sodium sulfate and concentrated. The residue is crystallized with isopropanol to yield 13.3 g (97.2%) of a 1:1 mixture of the title compounds as solid. Melting Point: 151-152° C. (isopropanol)
A mixture of 13.3 g (47.8 mmol) of (5-nitro-1H-benzoimidazol-2-yl)-carbamic acid tert-butyl ester and (6-nitro-1H-benzimidazol-2-yl)-carbamic acid tert-butyl ester, 100 ml of methanol, 100 ml of tetrahydrofuran and 1 g of 10% Pd/C catalyst is hydrogenated. After completion of the reaction, the catalyst is filtered off, washed with tetrahydrofuran and the filtrate is concentrated. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and chloroform:methanol=10:1 as eluent to yield 4.72 g (40.4%) of (6-amino-1H-benzoimidazol-2-yl)-carbamic acid tert-butyl ester (Rf. 0.5), Melting Point: 159° C. (diethyl ether) and 4.2 g (36.0%) of (5-amino-1H-benzoimidazol-2-yl)-carbamic acid tert-butyl ester (Rf. 0.4) Melting Point: 168° C. (diethyl ether)
To a stirred solution of 1.0 g (4.06 mmol) of (6-amino-1H-benzimidazol-2-yl)-carbamic acid tert-butyl ester and 0.8 ml (5.7 mmol) of triethylamine in 30 ml of chloroform 1.5 g (5.6 mmol) of (4-benzyl-piperidin-1-yl)-oxo-acetyl chloride (Example 38c) in 20 ml of chloroform is added dropwise at 0° C. The reaction mixture is stirred at room temperature for 1 hour, then washed with water and the organic layer is concentrated. The residue is crystallized with a mixture of chloroform-methanol=10:1 to yield 1.3 g (67.1%) of the title compound. Melting Point: 192° C. (chloroform-methanol=10:1).
To a solution of 5 ml of 5% trifluoroacetic acid in dichloromethane 0.8 g (1.67 mmol) of {5-[2-(4-benzyl-piperidin-1-yl)-2-oxo-acetylamino]-1H-benzimidazol-2-yl}-carbamic acid tert-butyl ester is added. The reaction mixture is stirred for 48 hours at 20° C. The precipitated crystals are filtered off and washed with dichloromethane to yield 0.8 g (97.1%) of the title compound. Melting Point: 121° C.
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 2,6-diamino-benzthiazole [Arch. Pharm., 13, 48. (1935)] according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 203° C. (isopropanol)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 5-amino-1,3-dihydro-2,1-benzisothiazole-2,2-dioxide [J. Het. Chem., 23, 1645. (1986)] according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 181-182° C. (isopropanol)
The title compound is prepared from 4-(4-tert-butyl-benzyl)-piperidine [J. Org. Chem. 64, 3763. (1999)] and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: oil
The title compound is prepared from [4-(4-tert-butyl-benzyl)-piperidin-1-yl]-oxo-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: oil.
The title compound is prepared from [4-(4-tert-butyl-benzyl)-piperidin-1-yl]-oxo-acetic acid and 6-amino-3H-benzoxazol-2-one according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 168° C. (diethylether-hexane-diisopropyl ether).
Under argon, to a stirred solution of 5.0 g (26.4 mmol) of N-benzyl-4-piperidone (Aldrich) and 7.0 g (27.6 mmol) of (4-cyano-benzyl)-phosphoric acid diethyl ester [J. Chem. Soc. Perkin Trans 2., 3, 395. (2001)]) in 50 ml of dimethylformamide 1.5 g (60%, 37.5 mmol) of sodium hydride is added at 0° C. The reaction mixture is stirred for 4 hours at 20° C., 1 ml of ethanol is added dropwise, poured into 100 ml of water and extracted with diethylether. The organic layer is dried over sodium sulfate and concentrated. The crude product is used in the next step. Melting Point: oil.
A mixture of 8.25 g (28.6 mmol) of 4-(1-benzyl-piperidin-4-ylidenemethyl)-benzonitrile, 200 ml of ethanol and 0.5 g of 10% Pd/C catalyst is hydrogenated. After completion of the reaction, the catalyst is filtered off, washed with tetrahydrofuran and the filtrate is concentrated. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 95-96° C. (diisopropyl ether).
To a stirred solution of 0.5 g (1.72 mmol) of 4-(1-benzyl-piperidin-4-ylmethyl)-benzonitrile in 3 ml of dichloroethan 0.2 ml (1.85 mmol) of 1-chloroethyl-chloroformate is added dropwise at 0° C. The reaction mixture is stirred at 0° C. for 1h and refluxed for 8 hours, then concentrated and the residue is refluxed in 10 ml of methanol. The reaction mixture is concentrated and the residue is crystallized with isopropanol to yield 0.384 g (94.4%) of the title compound. Melting Point: 194° C. (isopropanol).
The title compound is prepared from 6-amino-3H-benzoxazol-2-one and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: 180-186° C.
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid ethyl ester according to the method described in Example 1b. Melting Point: 254° C. (ethanol-water)
To a mixture of 0.3g (1.5 mmol) of N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid, 0.165 ml (1.5 mmol) of N-methyl-morpholine in 8 ml of dimethylformamid 0.2 ml (1.5 mmol) of isobutyl-chloroformate is added dropwise at 0° C. and the mixture is stirred at 0° C. for 1 hour. Then 0.333 g (1.4 mmol) of 4-piperidin-4-ylmethyl-benzonitrile hydrochloride and 0.165 ml (1.5 mmol) of N-methyl-morpholine are added and the reaction mixture is stirred at 0° C. for 1 hour, at room temperature for 16 hours. The reaction mixture is concentrated and the residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent to yield 0.045 g (8.0%) of the title compound. Rf.: 0.4. Melting Point: 259-260° C. (isopropanol).
The title compound is prepared from 4-(4-trifluoromethyl-benzyl)-piperidine [J. Org. Chem., 64, 3763. (1999)] and N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid (Example 43e) according to the method described in Example 43f. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 217° C. (isopropanol)
The title compound is prepared from N-(tert-butoxycarbonyl)-4-piperidone and (2,4-difluoro-benzyl)-phosphoric acid diethyl ester [Eur. J. Med. Chim. Ther., 27, 845. (1992)] according to the method described in Example 43a. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and hexane:ethyl acetate=4:1 as eluent. Melting Point: oil
The title compound is prepared from 4-(2,4-difluoro-benzylidene)-piperidin-1-carboxylic acid tert-butyl ester according to the method described in Example 43a. The crude product is used in the next step. Melting Point: oil
The title compound is prepared from 4-(2,4-difluoro-benzyl)-piperidin-1-carboxylic acid tert-butyl ester according to the method described in Example 29b. Melting Point: 191° C. (ethyl acetate-diethyl ether)
The title compound is prepared from 4-(2,4-difluoro-benzyl)-piperidine and N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid (Example 43e) according to the method described in Example 43f. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 231° C. (isopropanol)
The title compound is prepared from [4-(4-fluoro-benzyl) piperidin-1-yl]-oxo-acetic acid (Example 1a) and 5-amino-1,3-dihydro-2,1-benzisothiazole-2,2-dioxide according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 183-184° C. (isopropanol)
The title compound is prepared from 4-(3,4-difluoro-benzyl)-piperidine [J. Org. Chem., 64, 3763. (1999)] and N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid (Example 43e) according to the method described in Example 43f. The residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 233° C. (isopropanol)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 2-trifluoromethyl-1(3)H-benzimidazol-5-ylamine (NL 6501323, CA 66; 28771) according to the method described in Example 2. The filtered crystals are purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. Melting Point: 142° C. (isopropanol).
The title compound is prepared from 6-amino-4H-benzo[1,4]oxazin-3-one [Indian J. Chem. Sect. B, 24, 1263. (1985)] and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) according to the method described in Example 2. Melting Point: 197-200° C. (diethylether)
The title compound is prepared from 6-amino-4H-benzo[1,4]oxazin-3-one and (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) according to the method described in Example 1c. Melting Point: 186-187° C. (diethylether)
The title compound is prepared from 5-amino-benzimidazole and (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) according to the method described in Example 1c. Melting Point: 85-87° C. (diethylether)
The title compound is prepared from 6-aminoindazol (Aldrich) and (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) according to the method described in Example 1c. Melting Point: 160-164° C. (diethylether).
The title compound is prepared from 7-amino-4H-benzo[1,4]oxazine-3-one [J. Med. Chem., 32, 1627. (1989)] and ethyl chlorooxoacetate (Aldrich) according to the method described in Example 1a. Melting Point: 239-240° C. (water)
The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid ethyl ester and potassium hydroxide according to the method described in Example 1b. Melting Point: 232.5-235.5° C. (water)
The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid and 4-benzyloxy-piperidine [Tetrahedron Lett., 36 3465. (1995)] according to the method described in Example 1c. Melting Point: 143-146° C. (diethylether)
The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid (Example 53b) and 4-phenoxypiperidine according to the method described in Example 2. Melting Point: 196-199° C. (diethylether)
The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid (Example 53b) and 4-phenoxy-methyl-piperidine [DE 254 999 (1977)] according to the method described in Example 1c. Melting Point: 215-217° C. (diethylether)
The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid (Example 53b) and 4-phenethyl-piperidine [J. Amer. Chem. Soc., 72, 4953. (1950)] according to the method described in Example 1c. Melting Point: 128-132° C. (diethylether)
The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid (Example 53b) and phenyl-piperidine-4-yl-methanol [J. Amer. Chem. Soc.,52, 4006. (1930)] according to the method described in Example 1c. Melting Point: 195-197° C. (diethylether)
The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid (Example 53b) and 4-p-tolyloxy-piperidine according to the method described in Example 1c. Melting Point: 226-228° C. (diethylether)
The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid (Example 53b) and 4-(4-methylbenzyl)-piperidine [J Org. Chem., 64,3763. (1999)] according to the method described in Example 1c. Melting Point: 228-231° C. (diethylether)
The title compound is prepared from 6-amino-1H-benzimidazol-2-thiol [J. Chem. Soc., 1515 (1950)] and ethyl chlorooxoacetate (Aldrich) according to the method described in Example 1a Melting Point: 225-226° C. (water)
The title compound is prepared from N-(2-mercapto-3H-benzimidazole-5-yl)-oxalamic acid ethyl ester and potassium hydroxide according to the method described in Example 1b Melting Point: 276-280° C. (water)
The title compound is prepared from N-(2-mercapto-3H-benzimidazol-5-yl)-oxalamic acid and 4-benzyl-piperidine according to the method described in Example 1c. Melting Point: 277-281° C. (diethylether)
The title compound is prepared from 6-amino-3H-benzothiazol-2-one [Liebigs Ann. Chem., 277, 244 (1893)] and ethyl chlorooxoacetate (Aldrich) according to the method described in Example 1a Melting Point: 226-231° C. (water)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzothiazol-6-yl)-oxalamic acid ethyl ester and potassium hydroxide according to the method described in Example 1b Melting Point: 275-278° C. (water)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzothiazole-6-yl)-oxalamic acid and 4-benzylpiperidine according to the method described in Example 1c. Melting Point: 201-203° C. (diethylether)
The title compound is prepared from N-(2-mercapto-3H-benzimidazol-5-yl)-oxalamic acid (Example 60b) and 4-(4-fluoro-benzyl)-piperidine according to the method described in Example 1c. Melting Point: 286-288° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzothiazol-6-yl)-oxalamic acid (Example 61b) and 4-(4-fluoro-benzyl)-piperidine according to the method described in Example 1c. Melting Point: 223.5-225.5° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzothiazol-6-yl)-oxalamic acid (Example 61b) and 4-p-tolyloxy-piperidine according to the method described in Example 1c. Melting Point: 215-217° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzothiazol-6-yl)-oxalamic acid (Example 61b) and 4-(4-methyl-benzyl)-piperidine according to the method described in Example 1c. Melting Point: 221-222° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzothiazol-6-yl)-oxalamic acid (Example 61b) and 4-(4-chloro-benzyl)-piperidine according to the method described in Example 1c. Melting Point: 245-247° C. (diethylether)
The title compound is prepared from N-(2-mercapto-3H-benzimidazol-5-yl)-oxalamic acid (Example 60b) and 4-p-tolyloxy-piperidine according to the method described in Example 1c. Melting Point: 311-314° C. (diethylether)
A stirred mixture of 1.0 g of 7-nitro-4H-benzo[1,4]oxazin-3-thione [Indian J. Chem. Sect. B, 12, 1279. (1984)] and 4.0 g of sodium dithionite in 30 ml of ethanol and 30 ml of water is refluxed for 2 hours. Then the reaction mixture is concentrated and the residue is submitted to column chromatography using Kieselgel 60 as adsorbent (Merck) and chloroform:methanol=9:1 as eluent to yield 0.33 g (38%) of the title compound. Melting Point: 205-211° C. (diethylether)
The title compound is prepared from 7-amino-4H-benzo[1,4]oxazin-3-thione and (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) according to the method described in Example 1c. Melting Point: 193-196° C. (diethylether)
The title compound is prepared from N-(3-aminophenyl)-2-(4-benzyl-piperidin-1-yl)-2-oxo-acetamide (Example 11) and N-(tert-butoxycarbonyl)glycine (Aldrich) according to the method described in Example 1c. Melting Point: 81-85° C. (diethylether)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 4-nitroaniline (Aldrich) according to the method described in Example 1c. Melting Point: 162-165° C. (diethylether)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 3-aminobenzonitrile (Aldrich) according to the method described in Example 1c. Melting Point: oil.
A mixture of 0.7 g (2 mmol) of 2-(4-benzyl-piperidin-1-yl)-N-(3-cyanophenyl)-2-oxo-acetamide, 0.82 g (4 mmol) of azidotrimethyltin (Aldrich) and 20 ml of toluene is refluxed for 20 hours. The precipitated crystals are filtered off and treated with 20 ml of N hydrochloric acid to yield 0.42 g (54%) of the title compound. Melting Point: 159-161° C. (water)
The title compound is prepared from N-(4-cyanophenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxoacetamide (Example 9) and azidomethyltin (Aldrich) according to the method described in Example 71b. Melting Point: 123-125° C. (water)
The title compound is prepared from 2-(4-benzyl-piperidin-1-yl)-N-(4-nitrophenyl)-2-oxo-acetamide (Example 70) according to the method described in Example 11. The residue is treated with 2.5 N hydrochloric acid in ethyl acetate to yield the title compound. Melting Point: >260° C. (ethyl acetate)
The title compound is prepared from N-(4-cyanophenyl)-2-(4-benzyl)-piperidin-1-yl]-2-oxo-acetamide (Example 5c) and azidomethyltin (Aldrich) according to the method described in Example 86b. Melting Point: 127-129° C. (water)
A mixture of 0.5 g (1 mmol) of ({3-[2-(4-benzyl-piperidin-1-yl)-2-oxo-acetyl-amino]-phenylcarbamoyl}-methyl)-carbamic acid tert-butyl ester (Example 69) and 20 ml of 2.5 N hydrochloric acid in ethyl acetate is stirred at room temperature for 1 hour. The precipitated product is filtered off and washed with ethyl acetate to yield 0.41 g (95.1%) of the title compound. Melting Point: 85-90° C. (ethyl acetate)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 2-aminophenol (Aldrich) according to the method described in Example 1c. Melting Point: 121-125-165° C. (hexane)
The title compound is prepared from N-(3-aminophenyl)-2-[4-fluoro-(4-benzyl)-piperidin-1-yl)-2-oxo-acetamide (Example 16) and N-(tert-butoxycarbonyl)-glycine (Aldrich) according to the method described in Example 2. Melting Point: 79-83° C. (diisopropyl ether)
The title compound is prepared from [(3-{2-[4-(4-fluoro-benzyl-piperidin-1-yl)-2-oxo-acetylamino}-phenylcarbamoyl)-methyl)-carbamic acid tert-butyl ester (Example 77) according to the method described in Example 75. Melting Point: 120-125° C. (ethyl acetate)
The title compound is prepared from N-(3-cyano-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxo-acetamide (Example 14) and azidomethyltin (Aldrich) according to the method described in Example 71. Melting Point: 107-112° C. (water)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 2-amino-benzonitrile (Aldrich) according to the method described in Example 1c. Melting Point: 101-103° C. (diethylether)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 5-aminoindan (Aldrich) according to the method described in Example 1c. Melting Point: 150-152° C. (diethylether)
To a stirred solution of 0.51 g (1.5 mmol) of N-(3-aminophenyl)-2-(4-benzyl-piperidin-1-yl)-oxo-acetamide (Example 11), 0.15 ml (1.5 mmol) of benzaldehyde, 0.18 ml (3 mmol) of acetic acid in 15 ml of dichloroethane 0.48 g (2.25 mmol) of sodium triacetoxyborohydride (Aldrich) is added in small portions below 20° C., and the reaction mixture is stirred at room temperature for 2 hours. Then 30 ml of 8% sodium hydrogencarbonate solution is added to the mixture, the organic layer is separated and the water phase is extracted three times with 30 ml of chloroform. The combined organic layers are dried over sodium sulfate, concentrated and the residue is purified by column chromatography using Kieselgel 60 as adsorbent (Merck) and ethyl acetate:hexane=1:2 as eluent. The product is treated with 2.5 N hydrochloric acid in ethyl acetate solution to yield 0.25 g (36%) of the title compound. Melting Point: 190-207° C. (dec.) (ethyl acetate)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 5-aminoindan (Aldrich) according to the method described in Example 1c. Melting Point: 106-109° C. (diethylether)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 4-amino-phenol (Aldrich) according to the method described in Example 1c. Melting Point: 98-100° C. (diethylether)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 3-amino-phenol (Aldrich) according to the method described in Example 1c. Melting Point: 175-179° C. (diethylether)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 4-bromo-aniline (Aldrich) according to the method described in Example 1c. Melting Point: 131-132° C. (diethylether)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 5-amino-indole (Aldrich) according to the method described in Example 1c. Melting Point: 80-82° C. (ethyl acetate)
The title compound is prepared from N-(4-cyano-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxo-acetamide (Example 9) and azidomethyltin (Aldrich) according to the method described in Example 71b. Melting Point: 107-109° C. (water)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and aniline (Aldrich) according to the method described in Example 1c. Melting Point: 125-128° C. (diethylether)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 4-methyl-aniline (Aldrich) according to the method described in Example 1c. Melting Point: 115-117° C. (diethylether)
To a stirred solution of 0.53 g (1.5 mmol) of N-(3-aminophenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetamide (Example 16), 0.15 ml (1.5 mmol) of benzaldehyde, 0.18 ml (3 mmol) of acetic acid in 15 ml of dichloroethane 0.48 g (2.25 mmol) of sodium triacetoxyborohydride is added in small portions below 20° C., and the reaction mixture is stirred at room temperature for 2 hours. Then 30 ml of 8% sodium hydrogencarbonate solution is added to the mixture, the organic layer is separated and the water phase is extracted three times with 30 ml of chloroform. The combined organic layers are dried over sodium sulfate, concentrated and the residue is treated with 2.5 N hydrochloric acid in ethylacetate to yield 0.39 g (54%) of the title compound. Melting Point: 206-213° C. (dec.) (ethyl acetate)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 4-methoxyaniline (Aldrich) according to the method described in Example 1c. Melting Point: 144-146° C. (diethylether)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidine-1-yl]-oxo-acetic acid (Example 1b) and 4-nitro-aniline (Aldrich) according to the method described in Example 1c. Melting Point: 157-159° C. (diethylether)
A mixture of 0.64 g (2.4 mmol) of [4-(4-fluoro-benzyl)piperidin-1-yl]-oxo-acetic acid, 0.34 ml (2.4 mmol) of triethylamine, 0.35 g (2 mmol) of 4-bromo-aniline (Aldrich), 0.91 g (2.4 mmol) of HBTU and 10 ml of dimethylformamide is stirred at room temperature for 24 hours. The reaction mixture is concentrated. Then 30 ml of 8% sodium hydrogencarbonate solution and 30 ml of chloroform is added to the mixture. The organic layer is separated and the water phase is extracted three times with 20 ml of chloroform. The combined organic layers are dried over sodium sulfate, concentrated. The residue is treated with diethylether and the crystals are filtered off to yield 0.36 g (43%) of the title compound. Melting Point: 156-158° C. (diethylether)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidine-1-yl]-oxo-acetic acid (Example 1b) and 3-(trifluoromethyl)-aniline (Aldrich) according to the method described in Example 94. Melting Point: 113-115° C. (diethylether
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 4-methyl-aniline (Aldrich) according to the method described in Example 94. Melting Point: 125-126° C. (diethylether
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 4-methoxy-aniline (Aldrich) according to the method described in Example 94. Melting Point: 105-107° C. (diethylether
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxoacetic acid (Example 5b) and 3-(trifluoromethyl)-aniline (Aldrich) according to the method described in Example 1c. Melting Point: 87-89° C. (hexane)
The title compound is prepared from N-(4-amino-phenyl)-2-(4-benzyl-piperidin-1-yl)-2-oxo-acetamide hydrochloride (Example 73) and benzaldehyde (Aldrich) according to the method described in Example 91. Melting Point: 126-128° C. (diethylether)
The title compound is prepared from N-(4-amino-phenyl)-2-(4-benzyl-piperidin-1-yl)-2-oxo-acetamide hydrochloride (Example 73) and N-(tert-butoxycarbonyl)-glycine (Aldrich) according to the method described in Example 94. Melting Point: 177-179° C. (diisopropylether)
The title compound is prepared from 1-amino-1,3-dihydro-indol-2-one and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: 235-237° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-oxalamic acid_ethyl ester and potassium hydroxide according to the method described in Example 1b. Melting Point: 256° C. (water)
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-oxalamic acid_and 4-(4-methyl-benzyl)-piperidine according to the method described in Example 1c. Melting Point: 196-199° C. (diethylether)
The title compound is prepared from 5-aminoindole (Aldrich) and (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) according to the method described in Example 1c. Melting Point: 68-72° C. (hexane)
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-oxalamic acid_(Example 101b) and phenyl-[4]piperidyl-methanol according to the method described in Example 1c. Melting Point: 88-100° C. (dec.) (diethylether)
The title compound is prepared from 2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-N-(4-nitro-phenyl)-2-oxo-acetamide (Example 93) according to the method described in Example 11. Melting Point: 141-143° C. (diisopropylether-hexane).
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-oxalamic acid (Example 101b) and 4-(2-methyl-benzyl)-piperidine [J. Org. Chem., 64, 3763. (1999)] according to the method described in Example 1c. Melting Point: 211-213° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-oxalamic acid (Example 101b) and 4-phenoxy-methyl-piperidine according to the method described in Example 1c. Melting Point: 200-202° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-oxalamic acid (Example 101b) and 4-(4-methoxy-benzyl)-piperidine [U.S. Pat. No. 3,632,767 (1972)] according to the method described in Example 1c. Melting Point: 215-217° C. (diethylether)
The title compound is prepared from {4-[2-(4-benzyl-piperidin-1-yl)-2-oxo-acetylamino]-phenyl}-carbamic acid tert-butyl ester (Example 100) according to the method described in Example 75. Melting Point: 227-233 (dec.)° C. (diethylether)
The title compound is prepared from N-(4-amino-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxo-acetamide (Example 104) according to the method described in Example 12. Melting Point: 178-182° C. (diethylether)
The title compound is prepared from N-(4-amino-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxo-acetamide (Example 104) and benzaldehyde according to the method described in Example 82. Melting Point: 145-148° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-oxalamic acid_(Example 101b) and 4-(3-fluoro-benzyl)-piperidine [J. Org. Chem. 64, 3763. (1999)] according to the method described in Example 1c. Melting Point: 182-184° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-oxalamic acid_(Example 101b) and 4-phenethyl-piperidine according to the method described in Example 1c. Melting Point: 236-240° C. (diethylether)
The title compound is prepared from (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) and 3-amino-benzyl alcohol [Tetrahedron Lett. 41, 175. (2000)] according to the method described in Example 1c. Melting Point: 143-146° C. (diisopropylether)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 3-amino-benzyl alcohol according to the method described in Example 1c. Melting Point: 105-107° C. (diisopropylether)
To a stirred solution of 0.31 g (0.81 mmol) of 2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-N-(3-hydroxy-methyl-phenyl))-2-oxo-acetamide (Example 114) and 1 ml (12 mmol) of pyridine in 10 ml of toluene 0.9 ml (12 mmol) of thionyl chloride in 5 ml of toluene is added dropwise below 10° C., and the reaction mixture is stirred at room temperature for 4 hours. The reaction mixture is concentrated. Then 50 ml of 8% sodium hydrogenecarbonate solution and 20 ml of ethyl acetate is added to the mixture. The organic layer is separated and the water phase is extracted three times with 10 ml of ethyl acetate. The combined organic layers are dried over sodium sulfate, concentrated and the residue is purified by column chromatography using Kieselgel 60 as adsorbent (Merck) and hexane:ethyl acetate=2:1 as eluent to yield 0.05 g (16%) of the title compound. Melting Point: 104-110° C. (diethylether
The title compound is prepared from 2-(4-benzyl-piperidin-1-yl)-N-(3-hydroxy-methyl-phenyl))-2-oxo-acetamide (Example 113) and thionyl chloride according to the method described in Example 115. Melting Point: 92-95° C. (diisopropylether)
The title compound is prepared from (4-benzyl-piperidine-1-yl)-oxo-acetic acid (Example 5b) and 4-amino-benzyl alcohol (Fluka) according to the method described in Example 1c. Melting Point: 72-74° C. (hexane)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 1b) and 4-amino-benzyl alcohol (Fluka) according to the method described in Example 2. Melting Point: 80-85° C. (water)
The title compound is prepared from 4-(4-methyl-benzyl)-piperidin and ethyl oxalyl chloride according to the method described in Example 1a. Melting Point: oil
The title compound is prepared from [4-(4-methyl-benzyl-piperidin-1-yl)-oxo-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: 133-135° C. (ethanol-water)
The title compound is prepared from 5-amino-1,3-dihydro-indol-2-one and [4-(4-methyl-benzyl)-piperidin-1-yl)-oxo-acetic acid according to the method described in Example 1c. Melting Point: 216-220° C. (diethylether)
The title compound is prepared from 2-(4-benzyl-piperidin-1-yl)-N-(4-hydroxy-methyl-phenyl)-2-oxo-acetamide (Example 117) and thionyl chloride according to the method described in Example 115. Melting Point: 105-108° C. (diethylether)
The title compound is prepared from methanesulfonic acid-(4-amino-anilide) and [4-(4-methyl-benzyl)-piperidin-1-yl)-oxo-acetic acid (Example 119b) according to the method described in Example 94. Melting Point: 179-181° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid (Example 43e) and 4-(4-methoxy-benzyl)-piperidine according to the method described in Example 1c. Melting Point: 193-197° C. (diisopropylether)
The title compound is prepared from methanesulfonic acid-(4-amino-anilide) according to the method described in Example 1a. Melting Point: 136-139° C. (diisopropylether)
The title compound is prepared from N-(4-methanesulfonylamino-phenyl)-oxalamic acid ethyl ester according to the method described in Example 1b. Melting Point: >260° C. (ethanol-water)
The title compound is prepared from N-(4-methanesulfonylamino-phenyl)-oxalamic acid and 4-(4-methoxy-benzyl)-piperidine according to the method described in Example 1c. Melting Point: 206-208° C. (diethylether)
The title compound is prepared from N-(2-amino-phenyl)-methanesulfonamide [Aust.J. Chem.25, (1972) 1341] and (4-benzyl-piperidin-1-yl)-oxo-acetic-acid (Example 5b) according to the method described in Example 1c. Melting Point: 154-156° C. (diethylether)
The title compound is prepared from N-(2-amino-phenyl)-methanesulfonamide and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic-acid (Example 1b) according to the method described in Example 1c. Melting Point: 166-168° C. (diethylether)
The title compound is prepared from 4-(trifluoromethyl)-aniline and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic-acid (Example 1b) according to the method described in Example 1c. Melting Point: 109-111° C. (diisopropylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid (Example 43e) and 4-(3-methoxy-benzyl)-piperidine [U.S. Pat. No. 3,632,767 (1972)] according to the method described in Example 2. Melting Point: 110-115° C. (diisopropylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid (Example 43e) and 4-(3-methyl-benzyl)-piperidine according to the method described in Example 2. Melting Point: 204-208° C. (diisopropylether)
The title compound is prepared from 5-amino-isoindole-1,3-dione [Tetrahedron 54, 7485. (1998)] and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic-acid (Example 1b) according to the method described in Example 1c. Melting Point: 226-228° C. (diethylether)
The title compound is prepared from 5-amino-isoindole-1,3-dione and (4-benzyl-piperidin-1-yl)-oxo-acetic-acid (Example 5b) according to the method described in Example 1c. Melting Point: 239-241° C. (diethylether)
The title compound is prepared from N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-oxalamic acid (Example 43e) and 4-(3-fluoro-benzyl)-piperidine according to the method described in Example 1c. Melting Point: 215-217° C. (diethylether)
The title compound is prepared from sulfanilamide (Aldrich) and [4-(4-fluoro-benzyl)-piperidin-1-yl]oxo-acetic-acid (Example 1b) according to the method described in Example 1c. Melting Point: 201-203° C. (diethylether)
The title compound is prepared from sulfanilamide (Aldrich) and (4-benzyl-piperidin-1-yl)-oxo-acetic-acid (Example 5b) according to the method described in Example 1c. Melting Point: 184-187° C. (diethylether)
To a stirred solution of 0.68 g (2 mmol) of 2-(4-benzyl-piperidin-1-yl)-N-(4-hydroxy-phenyl)-2-oxo-acetamide (Example 18) and 0.42 ml (3 mmol) of triethylamine in 20 ml of chloroform 0.2 ml (3 mmol) of acetyl chloride in 5 ml of chloroform is added dropwise below 10° C., and the reaction mixture is stirred at room temperature for 3 hours. The solvent is evaporated and the residue is treated with water and the crystals are filtered off to yield 0.7 g (92%) of the title compound. Melting Point: 149-151° C. (water)
The title compound is prepared from 2-(4-benzyl-piperidin-1-yl)-N-(4-hydroxy-phenyl)-2-oxo-acetamide (Example 18) and methanesulfonyl chloride according to the method described in Example 154. Melting Point: 177-179° C. (water)
The title compound is prepared from 5-amino1H-indole-2,3-dion [Helv. Chim-Acta 19, 1327. (1936)] and [4-(4-fluoro-benzyl)-piperidin-1-yl]-oxo-acetic-acid (Example 1b) according to the method described in Example 1c. Melting Point: 205-206° C. (diethylether)
The title compound is prepared from 5-amino-1H-indole-2,3-dion [Helv. Chim-Acta 19, 1327. (1936)] and (4-benzyl-piperidin-1-yl)-oxo-acetic-acid (Example 5b) according to the method described in Example 1c. Melting Point: 234-236° C. (diethylether)
The title compound is prepared from [4-(4-methyl-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 119b) and 5-amino-1,3-dihydro-benzimidazole-2-one according to the method described in Example 1c. Melting Point: >280° C. (diethylether)
The title compound is prepared from [4-(4-methyl-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 119b) and 6-amino-3,4-dihydro-1H-quinoline-2-one [J.Chem. Soc., 183. (1969)] according to the method described in Example 2. Melting Point: 209-213° C. (water)
The title compound is prepared from N-methyl-benzene-1,4-diamine [J. Chem. Soc., 395. (1944)] and (4-benzyl-piperidin-1-yl)-oxo-acetic-acid (Example 5b) according to the method described in Example 1c. Melting Point: 227-228° C. (ethyl acetate)
The title compound is prepared from [4-(4-methyl-benzyl)-piperidin-1-yl]-oxo-acetic acid (Example 119b) and 5-amino-1,3-dihydro-2,1-benzisothiazole-2,2-dioxide according to the method described in Example 94. Melting Point: 186° C. (isopropanol)
To a stirred solution of 1.5 g (10 mmol) of 6-amino-3H-bezonzoxazol-2-one and 3.4 ml (24 mmol) of triethylamine in 90 ml of chloroform 2 ml (24 mmol) of chloroacetyl chloride in 20 ml of chloroform is added dropwise below 10° C., and the reaction mixture is stirred at room temperature for 10 hours. The reaction mixture is concentrated and 100 ml of 8% sodium hydrogencarbonate solution is added to the residue. The precipitated product is filtered off, and washed with water to yield 1.76 g (78%) of the title compound. Melting Point: 228-231° C. (water)
A mixture of 0.91 g (4 mmol) of 2-chloro-N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-acetamide, 0.7 g (4 mmol) of potassium iodide, 1.2 ml (8 mmol) of triethylamine, 0.7 g (3 mmol) of 4-(4-fluoro-benzyl)-piperidine hydrochloride and 50 ml of acetonitrile is refluxed for 20 hours. The reaction mixture is concentrated and 30 ml of water and 30 ml of chloroform are added to the residue. The organic layer is separated and the water phase is extracted three times with 10 ml of chloroform. The combined organic layers are dried over sodium sulfate, concentrated and the residue is purified by column chromatography using Kieselgel 60 adsorbent (Merck) and chloroform methanol=97:3 as eluent to yield 0.3 g (26%) of the title compound. Melting Point: 232-234° C. (diethylether)
The title compound is prepared from 5-amino-1,3-dihydro-indol-2-one and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 166-170° C. (water)
A mixture of 0.9 g (4 mmol) of 2-chloro-N-(2-oxo-2,3-dihydro-1H-indol-5-yl)-acetamide, 0.7 g (4 mmol) of potassium iodide, 0.6 ml (4 mmol) of triethylamine, 0.53 ml (3 mmol) of 4-benzyl-piperidine and 50 ml of acetonitrile is refluxed for 20 hours. The reaction mixture is concentrated and 30 ml of water and 30 ml of chloroform are added to the residue. The organic layer is separated and the water phase is extracted three times with 10 ml of chloroform. The combined organic layers are dried over sodium sulfate, concentrated and the residue is treated with diethylether and the precipitated crystals are filtered off to yield 0.7 g (64%) of the title compound. Melting Point: 176-180° C. (diethylether)
The title compound is prepared from 2-chloro-N-(2-oxo-2,3-dihydro-1H-indol-5-yl)acetamide (Example 143a) and 4-(4-fluoro-benzyl)-piperidine hydrochloride according to the method described in Example 142b. Melting Point: 178-180° C. (diethylether)
The title compound is prepared from 2-chloro-N-(4-cyano-phenyl)-acetamide [J. Org. Chem., 23, 141. (1958)] and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 120-124° C. (diethylether)
The title compound is prepared from 2-chloro-N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-acetamide (Example 142a) and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 210-212° C. (water)
The title compound is prepared from 5-aminoindazol (Aldrich) and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 175-178° C. (diethylether)
The title compound is prepared from 2-chloro-N-(1H-indazol-5-yl)-acetamide and 4-benzyl-piperidine (Aldrich) according to the method described in Example 142b. Melting Point: 170-174° C. (diethylether)
The title compound is prepared from 2-chloro-N-(1H-indazol-5-yl)-acetamide (Example 147a) and 4-(4-fluoro-benzyl)-piperidine according to the method described in Example 142b. Melting Point: 149-152° C. (diethylether)
The title compound is prepared from 6-aminoindazol (Aldrich) and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 155-160° C. (diethylether)
The title compound is prepared from 2-chloro-N-(1H-indazol-6-yl)-acetamide and 4-(4-fluoro-benzyl)-piperidine according to the method described in Example 142b. Melting Point: 135-137° C. (diethylether)
The title compound is prepared from 2-chloro-N-(1H-indazol-6-yl)-acetamide (Example 149a) and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 165-169° C. (diethylether)
The title compound is prepared as an oil from 5-aminobenzimidazol and chloroacetyl chloride according to the method described in Example 142a.
The title compound is prepared from 2-chloro-N-(1H-benzimidazol-5-yl)-acetamide and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 185-189° C. (diethylether)
The title compound is prepared from 2-chloro-N-(1H-benzimidazol-5-yl)-acetamide (Example 151 a) and 4-(4-fluoro-benzyl)-piperidine according to the method described in Example 142b. Melting Point: 203.5-204.5° C. (diethylether)
The title compound is prepared from 7-amino-4H-benzo[1,4]oxazine-3-one and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 210-215° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-acetamide and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 184-188° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-acetamide (Example 153a) and 4-(4-fluoro-benzyl)-piperidine according to the method described in Example 142b. Melting Point: 209-211° C. (diethylether)
The title compound is prepared from 6-amino-4H-benzo[1,4]oxazin-3-one and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 258-261.5° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-yl)-acetamide and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 220-222° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-yl)-acetamide (Example 155a) and 4-(4-fluoro-benzyl)-piperidine according to the method described in Example 142b. Melting Point: 185-187° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-acetamide (Example 153a) and 4-phenoxy-piperidine according to the method described in Example 142b. Melting Point: 206-208° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-acetamide (Example 153a) and 4-phenoxy-methyl-piperidine according to the method described in Example 142b. Melting Point: 172-175° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-acetamide (Example 153a) and 4-benzyloxy-piperidine according to the method described in Example 142b. Melting Point: 238-240° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazine-7-yl)-acetamide (Example 153a) and 4-phenethyl-piperidine according to the method described in Example 142b. Melting Point: 200-203° C. (diethylether)
A mixture of 10.0 g (57.0 mmol) of 4-benzyl-piperidin, 10.0 g (72.4 mmol) of potassium carbonate, 7.5 ml (57.7 mmol) of ethyl-2-bromopropionate and 100 ml of acetone is refluxed for 1 hour. The reaction mixture is filtered and the filtrate is concentrated. The crude product is used in the next step.
To a stirred solution of 15.7 g (57.0 mmol) of 2-(4-benzyl-piperidin-1-yl)-propionic acid ethyl ester in 50 ml of ethanol and 50 ml of water 3.0 g (75.0 mmol) of sodium hydroxide is added. The reaction mixture is stirred for 6 hours at room temperature. The ethanol is distilled off under reduced pressure. The reaction mixture is acidified with 2M hydrochloric acid and the product is extracted with chloroform. The combined organic layers are washed with water, dried over sodium sulfate and concentrated to yield 13.1 (92.9%) of the title compound. Melting Point: oil.
A mixture of 0.5 g (2.0 mmol) of 2-(4-benzyl-piperidin-1-yl)-propionic acid hydrochloride, 0.3 ml (2.1 mmol) of triethylamine, 0.36 g (2.0 mmol) of 6-amino-3H-benzoxazol-2-one, 0.8 g (2.1 mmol) of HBTU and 10 ml of dimethylformamide is stirred at room temperature for 24 hours. The reaction mixture is concentrated and the residue is purified by column chromatography using Kieselgel 60 (Merck) as adsorbent and toluene:methanol=4:1 as eluent. The product is crystallized with diethylether to yield 0.095 g (11.6%) of the title compound. Melting Point: 116-118° C. (diethylether).
The title compound is prepared from 5-amino-1,3-dihydro-indol-2-one and 2-(4-benzyl-piperidin-1-yl)-propionic acid hydrochloride (Example 161b) according to the method described in Example 161c. Melting Point: 153-155° C. (diethylether).
The title compound is prepared from 4-phenoxy-piperidine and ethyl-bromoacetate according to the method described in Example 161a. Melting Point: oil.
The title compound is prepared from (4-phenoxy-piperidin-1-yl)-acetic acid ethyl ester according to the method described in Example 161b. Melting Point: 190-196° C. (water).
The title compound is prepared from (4-phenoxy-piperidin-1-yl)-acetic acid hydrochloride and 6-amino-3H-benzoxazol-2-one according to the method described in Example 161c. Melting Point: 193-195° C. (diethylether)
The title compound is prepared from 4-benzyl-piperidine and ethyl-bromoacetate according to the method described in Example 161a. Melting Point: oil.
The title compound is prepared from (4-benzyl-piperidin-1-yl)-acetic acid ethyl ester according to the method described in Example 161b. Melting Point: 222° C. (water).
The title compound is prepared from (4-benzyl-piperidin-1-yl)-acetic acid hydrochloride and 6-amino-3H-benzoxazole-2-thione according to the method described in Example 161c. Melting Point: 183-184° C. (isopropanol)
The title compound is prepared from 2-chloro-N-(4-cyano-phenyl)-acetamide and 4-(4-fluoro-benzyl)-piperidine hydrochloride according to the method described in Example 142b. Melting Point: 113-116° C. (diethylether)
The title compound is prepared from 3-amino-benzonitrile (Aldrich) and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 144-146° C. (water)
The title compound is prepared from 2-chloro-N-(3-cyano-phenyl)-acetamide and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 88-90° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-cyano-phenyl)-acetamide (Example 166a) and 4-(4-fluoro-benzyl)-piperidine hydrochloride according to the method described in Example 142b. Melting Point: 101-103° C. (diisopropylether)
A mixture of 0.4 g (1.2 mmol) of (2-(4-benzyl-piperidin-1-yl)-N-(4-cyano-phenyl)-acetamide (Example 145), 0.5 g (2.4 mmol) of azidotrimethyltin (Aldrich) and 20 ml of toluene is refluxed for 20 hours. The precipitated crystals are filtered off and treated with 20 ml of N hydrochloric acid to yield 0.26 g (56%) of the title compound. Melting Point: >260° C. (water)
The title compound is prepared from N-(4-cyano-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-acetamide (Example 165) and azidotrimethyltin according to the method described in Example 168. Melting Point: 251-257° C. (water)
The title compound is prepared from 2-(4-benzyl-piperidine-1-yl)-N-(3-cyano-phenyl)-acetamide (Example 166b) and azidotrimethyltin according to the method described in Example 168. Melting Point: 89-93° C. (water)
The title compound is prepared from N-(3-cyano-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-acetamide (Example 167) and azidotrimethyltin according to the method described in Example 168. Melting Point: 102-106° C. (water)
The title compound is prepared from 2-chloro-N-(3-nitro-phenyl)-acetamide [Tetrahedron Lett. 39, 7459. (1998)] and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 102-104° C. (diethylether)
The title compound is prepared from 2-chloro-N-(4-nitro-phenyl)-acetamide [J. Amer. Chem. Soc. 45, 1997. (1923)] and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 126-128° C. (diethylether)
A mixture of 2.5 g (7 mmol) of 2-(4-benzyl-piperidin-1-yl)-N-(4-nitro-phenyl)-acetamide (Example 173), 140 ml of dimethylformamide, 0.7 g of 10% Pd/C catalyst is hydrogenated for 4 hours. The catalyst is filtered off, washed with dimethylformamide and the filtrate is concentrated. The residue is treated with diethylether and 2.5 N hydrochloric acid in ethyl acetate and the precipitated crystals are filtered off to yield 2.4 g (96%) of the title compound. Melting Point: >260° C. (diethylether-ethyl acetate)
The title compound is prepared from 2-(4-benzyl-piperidin-1-yl)-N-(3-nitrophenyl)acetamide (Example 172) according to the method described in Example 174. Melting Point: 80-110° C. (dec.) (diethylether-ethyl acetate)
To a stirred solution of 0.36 g (1 mmol) of N-(3-amino-phenyl)-2-(4-benzyl-piperidin-1-yl)-acetamide dihydrochloride (Example 175) and 0.24 ml (3 mmol) of pyridine in 10 ml of dichloromethane 0.16 ml (2 mmol) of methanesulfonyl chloride in 5 ml of dichloromethene is added dropwise below 10° C., and the reaction mixture is stirred at room temperature for 10 hours. Then 20 ml of 8% sodium hydrogencarbonate solution is added to the mixture, the organic layer is separated and the water phase is extracted three times with 10 ml of dichloromethane. The combined organic layers are washed with 20 ml of water and dried over sodium sulfate, concentrated, the residue is treated with diethylether and 2.5 N hydrochloric acid in ethyl acetate and the precipitated crystals are filtered off to yield 0.32 g (73%) of the title compound. Melting Point: 110-114° C. (diethylether-ethyl acetate)
To a stirred solution of 0.32 g (1 mmol) of N-(3-amino-phenyl)-2-(4-benzyl-piperidin-1-yl)-acetamide (Example 175), 0.1 ml (1 mmol) of benzaldehyde, 0.12 ml (2 mmol) of acetic acid in 10 ml of dichloroethane 0.32 g (1.5 mmol) of sodium triacetoxyborohydride is added in small portions below 20° C., and the reaction mixture is stirred at room temperature for 2 hours. Then 20 ml of 8% sodium hydrogencarbonate solution is added to the mixture. The organic layer is separated and the water phase is extracted three times with 10 ml of dichloromethane. The combined organic layers are washed with 20 ml of water and dried over sodium sulfate, concentrated, the residue is treated with diethylether and the precipitated crystals are filtered off to yield 0.26 g (63%) of the title compound. Melting Point: 112-114° C. (ethyl acetate)
The title compound is prepared from 2-chloro-N-(4-nitro-phenyl)-acetamide and 4-(4-fluoro-benzyl)-piperidine hydrochloride according to the method described in Example 142b. Melting Point: 120-123° C. (diethylether)
The title compound is prepared from 2-chloro-N-(3-nitrophenyl)-acetamide and 4-(4-fluoro-benzyl-piperidine hydrochloride according to the method described in Example 142b. Melting Point: 118-120° C. (diethylether)
The title compound is prepared from methanesulfonic acid-(4-amino-anilide) and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 174-177° C. (water)
The title compound is prepared from 2-chloro-N-(4-methanesulfonylamino-phenyl)-acetamide and 4-benzyl-piperidine according to the method described in Example 142b. Melting Point: 102-106° C. (hexane)
The title compound is prepared from 2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-N-(4-nitro-phenyl)-acetamide (Example 178) according to the method described in Example 174. Melting Point: 258° C. (dec.) (diethylether-ethyl acetate)
The title compound is prepared from 2-chloro-N-(4-methanesulfonylamino-phenyl)-acetamide (Example 180a) and 4-(4-fluoro-benzyl)-piperidine hydrochloride according to the method described in Example 142b. Melting Point: 169-171° C. (hexane)
The title compound is prepared from 2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-N-(3-nitro-phenyl)-acetamide (Example 79) according to the method described in Example 174. Melting Point: 105-110° C. (diethylether-ethyl acetate)
The title compound is prepared from 2-chloro-N-(4-methanesulfonylamino-phenyl)-acetamide (Example 180) and 4-(methyl-p-tolyl-amino)-piperidine [Arzneimittel Forschung/Drug Research 44(II), 989. (19994)]) according to the method described in Example 142b. Melting Point: 128-130° C. (diethylether)
To a stirred solution of 0.38 g (1 mmol) of N-(4-amino-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-acetamide dihydrochloride (Example 181) and 0.28 ml (2 mmol) of triethylamine in 10 ml of dichloromethane 0.1 ml (1 mmol) of acetic anhydride in 2 ml of dichloromethane is added dropwise below 10° C., and the reaction mixture is stirred at room temperature for 3 hours. The solvent is evaporated and the residue is treated with water and the crystals are filtered off to yield 0.15 g (39%) of the title compound. Melting Point: 173-180° C. (water)
The title compound is prepared from N-(4-aminophenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-acetamide dihydrochloride (Example 181) and benzaldehyde according to the method described in Example 177. Melting Point: 84-106° C. (dec.) (diethylether-ethyl acetate)
The title compound is prepared from N-(4-amino-phenyl)-2-(4-benzyl-piperidin-1-yl)-acetamide dihydrochloride (Example 174) and benzaldehyde according to the method described in Example 177. Melting Point: 147° C. (dec.) (diethylether-ethyl acetate)
The title compound is prepared from N-(3-amino-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-acetamide dihydrochloride (Example 183) and methanesulfonyl chloride according to the method described in Example 176. Melting Point: 85-90° C. (dec.) (diethylether- ethyl acetate)
The title compound is prepared from N-(3-amino-phenyl)-2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-acetamid dihydrochloride (Example 183) and benzaldehyde according to the method described in Example 177. Melting Point: 98-100° C. (diethylether-hexane)
The title compound is prepared from 2-chloro-N-(4-methoxy-phenyl)-acetamide [J. Heterocycl. Chem., 32, 1429. (1995)] and 4-benzyl-piperidine according to the method described in Example 143b. Melting Point: 81-83° C. (hexane)
The title compound is prepared from 2-chloro-N-(4-methoxyphenyl)-acetamide and 4-benzyl-piperidine according to the method described in Example 143b. Melting Point: 121-124° C. (hexane)
To a stirred solution of 0.68 g (2 mmol) of 2-(4-benzyl-piperidin-1-yl)-N-(4-methoxy-phenyl)-acetamide (Example 190) and in 30 ml of dichloromethane 0.95 ml (10 mmol) of boron tribromide in 9 ml of dichloromethane is added dropwise at −20° C., and the reaction mixture is stirred at room temperature for 10 hours. The reaction mixture is concentrated. Then 30 ml of 8% sodium hydrogenecarbonate solution and 20 ml of chloroform are added to the mixture. The organic layer is separated and the water phase is extracted three times with 20 ml of chloroform. The combined organic layers are dried over sodium sulfate, concentrated and the residue is purified by column chromatography using Kieselgel 60 as adsorbent (Merck) and chloroform:methanol=9:1 as eluent to yield 0.4 g (62%) of the title compound. Melting Point: 66-70° C. (hexane)
The title compound is prepared from 2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-N-(4-methoxy-phenyl)-acetamide (Example 191) according to the method described in Example 192. Melting Point: 70-77° C. (hexane)
To a stirred suspension of 1,5 g (3.9 mmol) of 2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-N-(2-oxo-2,3-dihydro-1H-benzoxazol-6-yl)-acetamide (Example 142b) in 40 ml of diethylether is added 4 ml of 2.5 N hydrochloric acid in ethyl acetate. The mixture is stirred for 1 h at room temperature, the crystals are filtered off and washed with diethylether to yield 1.64 g (100%) of the title compound. Melting Point: 210-216° C. (dec.) (diethylether)
The title compound is prepared from 5-amino-2-oxo-2,3-dihydro-benzimidazol and chloroacetyl chloride according to the method described in Example 142a. Melting Point: >280° C. (water)
The title compound is prepared from 4-benzyl-piperidine and 2-chloro-N-(2-oxo-2,3-dihydro-1H-benzimidazol-5-yl)-acetamide according to the method described in Example 142b. Melting Point: 270° C. (diethylether
The title compound is prepared from 4-(4-fluorobenzyl)-piperidine and 2-chloro-N-(2-oxo-2,3-dihydro-1H-benzimidazol-5-yl)-acetamide (Example 195a) according to the method described in Example 142b. Melting Point: 273-274° C. (diethylether)
The title compound is prepared from 4-(4-fluoro-benzyl)-piperidine and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 85-87° C. (water)
The title compound is prepared from 2-chloro-1-[4-(4-fluoro-benzyl)-piperidine-1-yl]-ethanone and 5-amino-1,3-dihydro-benzimidazol-2-one according to the method described in Example 142b. Melting Point: 249-251° C. (diethylether)
The title compound is prepared from 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) and 6-amino-3H-benzoxazol-2-one according to the method described in Example 142b. Melting Point: 202-205° C. (diethylether)
The title compound is prepared from 5-aminoindazol (Aldrich) and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 142b. Melting Point: 113-114° C. (diethylether)
The title compound is prepared from 4-benzyl-piperidine and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 42-47° C.
The title compound is prepared from 5-aminoindazol and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone according to the method described in Example 142b. Melting Point: 153-155° C. (diethylether)
The title compound is prepared from 7-amino-4H-benzo[1,4]oxazine-3-one and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 142b. Melting Point: 156-161° C. (diethylether).
The title compound is prepared from 7-amino-4H-benzo[1,4]oxazine-3-one and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 142b. Melting Point: 172-175° C. (diethylether).
The title compound is prepared from 6-aminoindazol and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example
The title compound is prepared from 6-aminoindazol and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 142b. Melting Point: 179-182° C. (diethylether)
The title compound is prepared from 6-amino-4H-benzo[1,4]oxazin-3-one and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 142b. Melting Point: 220-223° C. (diethylether)
A mixture of 1.08g (4 mmol) of 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a), 1.5 g (8 mmol) of methanesulfonic acid-(4-amino-anilide), 0.68 g (4 mmol) of potassium iodide, 1.2 ml (8 mmol) of triethylamine and 40 ml of toluene is refluxed for 3 hours. The reaction mixture is concentrated and 30 ml of water and 30 ml of chloroform are added to the residue The organic layer is separated and the water phase is extracted three times with 10 ml of chloroform. The combined organic layers are dried over sodium sulfate. Concentrated and the residue is purified by column chromatography using Kieselgel 60 adsorbent (Merck) and chloroform:methanol=99:1 as eluent to yield 0.96 g (57%) of the title compound. Melting Point: 177-181° C. (diisopropylether)
The title compound is prepared from 6-amino-3H-benzothiazole-2-one and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 206. Melting Point: 196-199° C. (diethylether)
The title compound is prepared from 4-p-tolyloxy-piperidine and chloroacetyl chloride according to the method described in Example 142a. Melting Point: oil
The title compound is prepared from 6-amino-3H-benzothiazole-2-one and 2-chloro-1-(4-p-tolyloxy-piperidin-1-yl)-ethanone according to the method described in Example 206. Melting Point: 189-191° C. (diethylether)
The title compound is prepared from 7-amino-4H-benzo[1,4]oxazin-3-one and 2-chloro-1-(4-p-tolyloxy-piperidin-1-yl) ethanone (Example 208a) according to the method described in Example 206. Melting Point: 223-224° C. (diethylether)
The title compound is prepared from 6-amino-3H-benzothiazol-2-one and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 206. Melting Point: 149-155° C. (diethylether)
The title compound is prepared from 5-amino-1,3-dihydro-indol-2-one and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 206. Melting Point: 161-164° C. (diethylether)
The title compound is prepared from aniline and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 206. Melting Point: 107-109° C. (diethylether)
The title compound is prepared from methanesulfonic acid-(4-amino-anilide) and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 206. Melting Point: 168-171° C. (diethylether)
The title compound is prepared from 4-amino-benzonitrile and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 206. Melting Point: 204-206° C. (diethylether)
The title compound is prepared from 3-amino-benzonitrile (Fluka) and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 206. Melting Point: 138-142° C. (diethylether)
The title compound is prepared from 4-{2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxo-ethylamino}-benzonitrile (Example 214) and azidomethyltin (Aldrich) according to the method described in Example 71b. Melting Point: 188-192° C. (diethylether)
The title compound is prepared from 3-{2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxo-ethylamino}-benzonitrile (Example 215) and azidomethyltin according to the method described in Example 71b. Melting Point: 173-176° C. (diethylether)
The title compound is prepared from 5-amino-1,3-dihydro-indol-2-one and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 206. Melting Point: 155-160° C. (diethylether)
The title compound is prepared from 4-methoxy-aniline (Aldrich) and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 206. Melting Point: 141-143° C. (diisopropylether)
The title compound is prepared from 4-methoxy-aniline (Aldrich) and 2-chloro-1-(4-benzyl)-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 206. Melting Point: 117-119° C. (diisopropylether)
The title compound is prepared from 1-(4-benzyl-piperidin-1-yl)-2-(4-methoxy-phenylamino)-ethanone (Example 220) and boron tribromide according to the method described in Example 192. Melting Point: 138-140° C. (diethylether)
The title compound is prepared from 1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-(4-methoxy-phenylamino)-ethanone (Example 219) and boron tribromide according to the method described in Example 192. Melting Point: 155-157° C. (diethylether)
The title compound is prepared from 6-{2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxoethylamino}-3H-benzoxazol-2-one (Example 198) according to the method described in Example 194. Melting Point: 180-210° C. (dec.) (ethyl acetate)
The title compound is prepared from 5-amino-1,3-dihydro-benzimidazol-2-one and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 142b. Melting Point: 237-238° C. (diethylether)
The title compound is prepared from 5-[2-(4-benzyl-piperidin-1-yl)-2-oxo-ethylamino]-1,3-dihydro-bezimidazol-2-one (Example 224) according to the method described in Example 194. Melting Point: 215-230° C. (dec.) (ethyl acetate)
The title compound is prepared from 5-{2-[4-(4-fluoro-benzyl)-piperidin-1-yl]-2-oxo-ethylamino}-1,3-dihydro-benzimidazol-2-one (Example 197b) according to the method described in Example 194. Melting Point: 217-229° C. (dec.) (ethyl acetate)
The title compound is prepared from 4-(4-methyl-benzyl)-piperidine and chloroacetyl chloride according to the method described in Example 142a. Melting Point: oil.
The title compound is prepared from 2-chloro-1-[4-(4-methyl-benzyl)-piperidin-1-yl]-ethanone and methanesulfonic acid-(4-aminoanilide) according to the method described in Example 206. Melting Point: 133-135° C. (diisopropylether)
The title compound is prepared from 2-chloro-1-[4-(4-methyl-benzyl)-piperidin-1-yl]-ethanone (Example 227a) and 6-amino-3H-benzoxazol-2-one according to the method described in Example 206. Melting Point: 212-215° C. (methanol)
The title compound is prepared from 2-chloro-1-[4-(4-methyl-benzyl)-piperidin-1-yl]-ethanone (Example 227a) and 7-amino-4H-benzo[1,4]oxazine-3-one according to the method described in Example 206. Melting Point: 206-208° C. (ethanol)
The title compound is prepared from 4-(4-chloro-benzyl)-piperidine and chloroacetyl chloride according to the method described in Example 142a. Melting Point: 70° C. (water)
The title compound is prepared from 2-chloro-1-[4-(4-chloro-benzyl)-piperidin-1-yl]-ethanone and methanesulfonic acid-(4-aminoanilide) according to the method described in Example 206. Melting Point: 160° C. (isopropanol)
The title compound is prepared from 6-amino-3H-benzoxazol-2-one and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 142b. Melting Point: 204-206° C. (diethylether)
The title compound is prepared from 6-amino-3,4-dihydro-1H-quinoline-2-one and 2-chloro-1-(4-benzyl-piperidin-1-yl)-ethanone (Example 200a) according to the method described in Example 206. Melting Point: 184-187° C. (ethanol)
The title compound is prepared from 4-(4-chloro-phenoxy)-piperidine hydrochloride (Example 30b) and chloroacetyl chloride according to the method described in Example 142a. Melting Point: oil
The title compound is prepared from 6-amino-3H-benzoxazol-2-one and 2-chloro-1-[4-(4-chloro-phenoxy)-piperidin-1-yl]-ethanone according to the method described in Example 206. Melting Point: 180-183° C. (diethylether)
The title compound is prepared from 6-amino-3,4-dihydro-quinolin-2-one and 2-chloro-1-[4-(4-chloro-phenoxy)-piperidin-1-yl]-ethanone (Example 233a) according to the method described in Example 206. Melting Point: 248-251° C. (diethylether)
The title compound is prepared from 5-amino-1,3-dihydro-benzimidazol-2-one and 2-chloro-1-[4-(4-chloro-phenoxy)-piperidin-1-yl]-ethanone (Example 233a) according to the method described in Example 206. Melting Point: 201-205° C. (diethylether)
The title compound is prepared from N-(4-aminophenyl)-methanesulfonamide and 2-chloro-1-[4-(4-chloro-phenoxy)-piperidin-1-yl]-ethanone (Example 233a) according to the method described in Example 206. Melting Point: 180-187° C. (diethylether)
The title compound is prepared from 6-amino-3,4-dihydro-quinolin-2-one and 2-chloro-1-[4-(4-fluoro-benzyl)-piperidin-1-yl]-ethanone (Example 197a) according to the method described in Example 206. Melting Point: 197-200° C. (ethyl alcohol)
The title compound is prepared from 4-benzyl-piperidine and 2-bromo-propionyl chloride according to the method described in Example 142a. Melting Point: oil.
A mixture of 1.03 g (3.33 mmol) of 1-(4-benzyl-piperidine-1-yl)-2-bromo-propan-1-one, 0.5 g (3.33 mmol) of 6-amino-3H-benzoxazol-2-one, 1.0 g (7.2 mmol) of potassium carbonate and 15 ml of dimethylformamide is refluxed for 5 hours. The reaction mixture is filtered and the filtrate is concentrated. The residue is purified by column chromatography using Kieselgel 60 adsorbent (Merck) and hexane:ethyl acetate=4:1 as eluent to yield 0.46 g (36.5%) of the title compound. Melting Point: 91° C. (hexane)
The title compound is prepared from N-(2-oxo-2,3-dihydro-1H-indole-5-yl)-oxalamic acid (Example 101b) and 3-benzyl-8-aza-bicyclo[3.2.1]octane [WO 20132179] according to the method described in Example 1c. Melting Point: 197.5-200° C. (diethylether)
The title compound is prepared from 5-amino-3H-benzoxazole-2-one and (4-benzyl-piperidin-1-yl)-oxo-acetic acid (Example 5b) according to the method described in Example 2. Melting Point: 187-190° C. (water)
The title compound is prepared from [4-(4-fluoro-benzyl)-piperidin-1-yl)-oxo-acetic acid (Example 1b) and 2-aminophenol according to the method described in Example 1c. Melting Point: 152-156° C. (hexane)
The title compound is prepared from 2-[4-(4-methoxy-benzyl)-piperidin-1-yl]-2-oxo-N-(2-oxo-2,3-dihydro-benzoxazol-6-yl)-acetamide (Example 122) according to the method described in Example 192. Melting Point:235-239° C. (diethylether)
The title compound is prepared from 2-chloro-1-[4-(4-chloro-phenoxy)-piperidin-1-yl]-ethanone (Example 233) and 7-amino-4H-benzo[1,4]oxazin-3-one according to the method described in Example 206. Melting Point:207-210° C. (methanol)
The title compound is prepared from 4-phenoxy-piperidine and chloroacetyl chloride according to the method described in Example 142a. Melting Point: oil
The title compound is prepared from 2-chloro-1-(4-phenoxy)-piperidin-1-yl]-ethanone and 6-amino-3H-benzoxazol-2-one according to the method described in Example 206. Melting Point:220-223° C. (diethylether)
The title compound is prepared from 2-chloro-1-[4-(4-chloro-phenoxy)-piperidin-1-yl]-ethanone (Example 233) and 4-methoxy-aniline according to the method described in Example 206. Melting Point: 127-130° C. (diethylether)
To a stirred solution of 5.6 g (30 mmol) of N-(4-amino-phenyl)-methanesulfonamide, 6.3 ml (30 mmol) of ethyl glyoxalate solution [˜50% in toluene (Fluka)], 3.4 ml (60 mmol) of acetic acid in 150 ml of dichloroethane 9.5 g (45 mmol) of sodium triacetoxyborohydride is added in small portions below 20° C., and the reaction mixture is stirred at room temperature for 10 hours. Then 200 ml of 8% sodium hydrogencarbonate solution is added to the mixture. The organic layer is separated and the water phase is extracted three times with 100 ml of chloroform. The combined organic layers are washed with 100 ml of water and dried over sodium sulfate. Concentrated, the residue is treated with diethylether and the precipitated crystals are filtered off to yield 4.48 g (55%) of the title compound. Melting Point: 135-138° C. (diethylether)
The title compound is prepared from (4-methanesulfonylamino-phenylamino)-acetic acid ethyl ester according to the method described in Example 1b. Melting Point: 218-223° C. (dec.) (water)
The title compound is prepared from (4-methanesulfonylamino-phenylamino)-acetic acid hydrochloride and 4-phenoxy-piperidine according to the method described in Example 1c. Melting Point: 179-182° C. (diethylether)
A mixture of 4.6g (20 mmol) of 4-(4-fluoro-benzyl)-piperidine hydrochloride, 4.5 ml (40 mmol) of ethyl-bromoacetate, 3.3 g (20 mmol) of potassium iodide and 200 ml of toluene is refluxed for 2 hours. The reaction mixture is concentrated. Then 150 ml of water and 150 ml of chloroform are added to the mixture. The organic layer is separated and the water phase is extracted three times with 50 ml of chloroform. The combined organic layers are washed 100 ml of water dried over sodium sulfate. Concentrated and the residue is treated with 2.5 N hydrochloric acid in ethyl acetate to yield the title compound. The crude product is used in the next step.
The title compound is prepared from [4-(4-fluoro-benzyl-piperidin-1-yl]-acetic acid ethyl ester hydrochloride according to the method described in Example 1b. The crude product is used in the next step.
The title compound is prepared from [4-(4-fluoro-benzyl-piperidin-1-yl]-acetic acid hydrochloride and 6-amino1H-benzimidazol-2-thiol according to the method described in Example 1c. Melting Point: 266-268° C. (diethylether)
Procedure “A”
For producing compound of formula (I), where X are —CO— group and R1, R2, Y, Z, U, V, n and m are as defined for the formula (I).
Step (1): Preparation of the ester compounds of formula (VIII)
where R1, R2, m, n, Y and Z have the same meaning as given for formula (I). 0.1 mmol of a secondary amines of formula (III)—where R1, R2, m, n, Y and Z have the same meaning as given for formula (I)—are solved in 0.4 ml of CH2Cl2. Solid-supported base 2.5 (diisopropylaminomethylpolystyrene, 3 mmol/g, Fluka, cat.nr.: 38343) (83 mg) and 11.2 μL of ethyl oxalylchloride are added to the solution. The mixture is vigorously shaken for 2 hours at 40° C. The slurry is filtered off, and the resin is washed 3 times with CH2Cl2. The filtrate is concentrated in vacuum. (yield: ˜100%)
Step (2): Hydrolysis of the above ester compounds to oxalic acid monoamides of formula (IX)
where R1, R2, m, n, Y and Z have the same meaning as given for formula (I).
The above obtained ester compounds of formula (VIII) are solved in 0.8 ml of ethanol and 120 mg of strongly basic ion exchange resin (DOWEX-2X8-100) in OH− form is added. The mixture is vigorously shaken for 16 hours at 60° C., then the solvent is filtered off. The resin is washed 3 times with ethanol. The resin then suspended in 0.8 ml of ethyl acetate, 0.8 ml of 1.5 M HCl/ethyl acetate is added and the mixture is vigorously shaken for 3 hours at room temperature. The resin is filtered off, washed with ethyl acetate and the filtrate is concentrated in vacuum. (yield: ˜100%)
Step (3): Coupling—The above obtained oxalic acid monoamides of formula (IX) are solved in 2 ml of CH2Cl2/DMF 1:1. 0.125 mmol of amine of formula (V)—where V and U areas given for formula (I)—and 0.25 mmol of 1-[3-(dimethylamino)-propyl]-3-ethylcarbodiimide (EDC) are added and the mixture is vigorously shaken for 12 hours. The mixture is diluted with 2 ml of CH2Cl2, and extracted with 4 mL of water three times. Solid supported 4-benzyloxybenzaldehyde (200 mg, 3 mmol/g, Novabiochem, Cat.nr.: 01-64-0182) is added to the organic solution and the mixture is vigorously shaken for 2 hours at 40° C. The resin is filtered off and the filtrate is concentrated to yield as final product the compounds of formula (I)—where X are —CO— group and R1, R2, Y, Z, U, V, n and m are as defined above.
Procedure “B”
For producing compound of formula (I)—where X is —CH2— group and R1, R2, Y, Z, U, V, n and m are as defined above.
Step (1): Preparation of the ester compounds of formula (X)
where R1, R2, m, n, Y and Z have the same meaning as given for formula (I).
0.1 mmol of a secondary amines of formula (III)—where R1, R2, m, n, Y and Z have the same meaning as given for formula (I)—and 0.04 g (0.28 mmol) of K2CO3 are solved in 0.8 ml of DMF. 12μl (0.128 mmol) of methyl bromoacetate is added and the mixture is vigorously shaken for 3 hours. 1.6 ml of diethyl ether is added to the mixture, and the precipitated salts are filtered off. The filtrate is concentrated in vacuum. (yield: ˜100%)
Step (2): Hydrolysis of the above ester compounds to substituted glycines of formula (XI)
where R1, R2, m, n, Y and Z have the same meaning as given for formula (I).
The above obtained ester compounds of formula (X) is solved in 0.8 ml of ethanol and 120 mg of strongly basic ion exchange resin (DOWEX-2X8-100) in OH− form is added. The mixture is vigorously shaken for 16 hours at 60° C., then the solvent is filtered off. The resin is washed 3 times with ethanol. The resin then suspended in 0.8 ml of ethyl acetate, 0.8 ml of 1.5 M HCl/ethyl acetate is added and the mixture is vigorously shaken for 3 hours at room temperature. The resin is filtered off, washed with ethyl acetate, and the filtrate is concentrated in vacuum. (yield: ˜100%)
Step (3): Coupling—The above obtained substituted glycines of formula (XI) is solved in 2 ml of CH2Cl2/DMF 1:1. 0.125 mmol of amine of formula (V)—where V and U areas given for formula (I)—and 0.25 mmol of EDC are added and the mixture is vigorously shaken for 12 hours. The mixture is diluted with 2 ml of CH2Cl2, and extracted with 4 ml of water three times. Solid-supported 4-benzyloxybenzaldehyde (200 mg, 3 mmol/g) is added to the organic solution, and the mixture is vigorously shaken for 2 hours at 40° C. The resin is filtered off and the filtrate is concentrated to yield as final product the compounds of formula (I)—where X is —CH2— group and R1, R2, Y, Z, U, V, n and m are as defined above.
Characterization and Purification Methods
Compounds of the present invention were characterized by high performance liquid chromatography coupled to mass selective detector (LC/MS) using HP 1100 Binary Gradient chromatography system with Microplate Sampler (Agilent, Waldbronn), controlled by ChemStation software. HP diode array detector was used to acquire UV spectra at 225 and 240 nm. All experiments were performed using HP MSD (Agilent, Waldbronn) single quadruple spectrometer equipped with an electrospray ionisation source to determine the structure.
The synthesized products were dissolved in 1 ml DMSO (Aldrich, Germany). 100 μl of each solution was diluted with DMSO to 1000 μl volume. Analytical chromatographic experiments were performed on Discovery RP C-16 Amide, 5 cm×4.6 mm×5 μm column from Supelco (Bellefonte, Pa.) with a flow rate of 1 ml/minute for qualification. The obtained compounds were characterized by their k′ value (purity, capacity factor). k′ factors are evaluated by the following formula:
k′=(tR−t0)/t0
k′=capacity factor, tR=retention time and t0=eluent retention time.
The A eluent was water containing 0.1% trifluoroacetic acid (TFA) (Sigma, Germany), the B eluent was 95% acetonitrile (Merck, Germany) containing 0.1% TFA and 5% A eluent. Gradient elution was used, starting with 100% A eluent and processing to 100% B eluent over a period of 5 minutes.
Semipreparative separation of the compounds of the present invention—purity below 85%—was carried out using the same high performance chromatography system. The separation was performed on Discovery RP C-16 Amide, 20 cm×10 mm×5 μm semipreparative column from Supelco (Bellefonte, Pa.) with a flow rate of 3 ml/minutes. The fraction collection was based on mass selective separation. Gradient elution was used, starting with 80% A eluent and processing to 65% B eluent over a period of 35 minutes for those compounds where the capacity factor was more than 2.5. The gradient elution was changed, starting with 100% A eluent and processing to 55% B eluent in 30 minutes for those compounds where the capacity factor was less than 2.5. The collected fractions were qualified by the above detailed analytical method and the solvent was evaporated by Speed Vac (Savant, USA).
The compounds prepared as described above in procedures “A” and “B” are shown in Tables 3, 4, 5 and 6, respectively.
Compounds of formula (I) prepared by procedure “A” described in Example 248 where X is —CO— group, both of —(CHR1)m— and —(CHR2)n— are —CH2—CH2— groups, Y, Z, U and V are as given below:
Compounds of formula (I) prepared by procedure “A” described in Example 248 where X is —CO— group, both of —(CHR1)m— and —(CHR2)n— are —CH2—CH2— groups, U and V form together a bivalente group and Y and Z are as given below:
Compounds of formula (I) prepared by procedure “B” described in Example 249 where X is —CH2— group, both of —(CHR1)m— and —(CHR2)n— are —CH2—CH2— groups Y, Z, U and V are as given below:
Compounds of formula (I) prepared by procedure “B” described in Example 249 where X is —CH2— group, both of —(CHR1)m— and —(CHR2)n— are —CH2—CH2— groups, U and V form together a bivalente group and Y and Z are as given below:
a) Tablets:
0.01-50% of active ingredient of formula I, 15-50% of lactose, 15-50% of potato starch, 5-15% of polyvinyl pyrrolidone, 1-5% of talc, 0.01-3% of magnesium stearate, 1-3% of colloid silicon dioxide and 2-7% of ultraamylopectin are mixed, then are granulated by wet granulation and pressed to tablets.
b) Dragées, Filmcoated Tablets
The tablets made according to the method described above are coated by a layer consisting of entero- or gastrosolvent film, or of sugar and talc. The dragées are polished by a mixture of beeswax and carnuba wax.
c) Capsules
0.01-50% of active ingredient of formula I, 1-5% of sodium lauryl sulfate, 15-50% of starch, 15-50% of lactose, 1-3% of colloid silicon dioxide and 0.01-3% of magnesium stearate are thoroughly mixed, the mixture is passed through a sieve and filled in hard gelatin capsules.
d) Suspensions
Ingredients: 0.01-15% of active ingredient of formula I, 0.1-2% of sodium hydroxide, 0.1-3% of citric acid, 0.05-0.2% of nipagin (sodium methyl 4-hydroxybenzoate), 0.005-0.02% of nipasol, 0.01-0.5% of carbopol (polyacrilic acid), 0.1-5% of 96% ethanol, 0.1-1% of flavoring agent, 20-70% of sorbitol (70% aqueous solution) and 30-50% of distilled water.
To solution of nipagin and citric acid in 20 ml of distilled water, carbopol is added in small portions under vigorous stirring, and the solution is left to stand for 10-12 h. Then the sodium hydroxide in 1 ml of distilled water, the aqueous solution of sorbitol and finally the ethanolic raspberry flavor are added with stirring. To this carrier the active ingredient is added in small portions and suspended with an immersing homogenizator. Finally the suspension is filled up to the desired final volume with distilled water and the suspension syrup is passed through a colloid milling equipment.
e) Suppositories
For each suppository 0.01-15% of active ingredient of formula I and 1-20% of lactose are thoroughly mixed, then 50-95% of adeps pro suppository (for example Witepsol 4) is melted, cooled to 35° C. and the mixture of active ingredient and lactose is mixed in it with homogenizator. The obtained mixture is mould in cooled forms.
f) Lyophilized Powder Ampoule Compositions
A 5% solution of mannitol or lactose is made with bidistilled water for injection use, and the solution is filtered so as to have sterile solution. A 0.01-5% solution of the active ingredient of formula I is also made with bidistilled water for injection use, and this solution is filtered so as to have sterile solution. These two solutions are mixed under aseptic conditions, filled in 1 ml portions into ampoules, the content of the ampoules is lyophilized, and the ampoules are sealed under nitrogen. The contents of the ampoules are dissolved in sterile water or 0.9% (physiological) sterile aqueous sodium chloride solution before administration.
It should be understood that the term “comprises/comprising” when used in this specification, is taken to specify the presence of stated features, integers, steps or components; but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and herein described in detail. It should be understood, however, that it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives failing within the spirit and scope of the invention as defined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0103055 | Jul 2001 | HU | national |
| 0202213 | Jul 2002 | HU | national |
This application is a continuation patent application of International application no. PCT/HU02/00071, filed Jul. 23, 2002, which claims priority to Hungarian patent application nos. P 0103055 (filed Jul. 24, 2001) and P 0202213 (filed Jul. 10, 2002). The International application and both Hungarian applications are each hereby incorporated by reference in their entirety.
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| Number | Date | Country | |
|---|---|---|---|
| 20040157886 A1 | Aug 2004 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/HU02/00071 | Jul 2002 | US |
| Child | 10761940 | US |
