Substituted pyrrole compounds and use thereof in pharmaceutical compositions

Abstract

The invention concerns substituted pyrrole compounds and their pharmaceutical applications. The compounds of the invention are potent inhibitors of lipoxygenase and cyclo-oxygenase and therefore are suitable to treat the set of rheumatic illnesses and to prevent allergically induced ailments. The compounds have the general formula: ##STR1## where R.sup.1 denotes a C.sub.1 -C.sub.12 alkyl group, R.sup.2 denotes a hydrogen atom or a C.sub.1 -C.sub.12 alkyl group, or R.sup.1 and R.sup.2 together with the carbon atom and the nitrogen atom to which they are bound form a ring of 5 to 8 links which may contain a sulfur heteroatom or a carbonyl group and may be substituted with one or two C.sub.1 -C.sub.4 alkyl groups,each time two of the residues R.sup.3, R.sup.4 and R.sup.5 independently from one another represent a hydrogen atom, a C.sub.5 -C.sub.8 cycloalkyl group, a C.sub.1 -C.sub.12 alkyl group or an aryl group which may be substituted by one or two residues selected from a halogen atom, a nitro-, a C.sub.1 -C.sub.4 alkoxy-, a hydroxy-, a C.sub.1 -C.sub.4 alkyl- or phenoxy-group, andwhere the third of the residues R.sup.3, R.sup.4 and R.sup.5 denotes --CHO, --CO.sub.2 H, --COSC.sub.1 -C.sub.4 -alkyl or A--X, with A being a straight-chain or a branched C.sub.1 -C.sub.8 alkylene group which may be interrupted by an oxygen heteroatom or a carbonyl group or being a C.sub.2 -C.sub.8 alkenylene group, X being CO.sub.2 H, SO.sub.3 H, CHO, OH or SH,as well as their pharmaceutically compatible salts and esters, for pharmaceutical applications.

Description

The invention concerns substituted pyrrole compounds and their applications to pharmacy and to drugs containing these compounds.

It is known that arachidonic acid metabolizes two different ways. In the cyclooxygenase way the cyclo-oxygenase enzyme metabolizes the arachidonic acid into prostaglandins. In the lipoxygenase way, the arachidonic acid affected by the lipoxygenases is metabolized into the so-called leucotrienes.

The prostaglandins take part in the generation of inflammation, fever and pain, whereas the leucotrienes are significant in the generation of asthma, inflammations and allergies. Frequently non-steroidal antiphlogistics such as derivatives of arylacetic-acid, 2-aryl-propionic-acid and anthranilic acid to fight those symptoms. These derivatives inhibit cyclo-oxygenase and thereby prevent the formation of prostaglandins from arachidonic acid. However the use of such derivatives is questionable on account of their side effects. On the other hand, drugs inhibiting lipoxygenase are not commercially available.

Now it was found in surprising manner that certain substituted pyrrole compounds are potent cyclo-oxygenase and/or lipoxygenase inhibitors and therefore are suitable to prevent allergically induced maladies and to treat the set of rheumatic illnesses.

Accordingly the object of the invention are substituted pyrrole compounds of the general formula I ##STR2## where R.sup.1 denotes a C.sub.1 -C.sub.12 alkyl group,

R.sup.2 is a hydrogen atom or a C.sub.1 -C.sub.12 alkyl group, or R.sup.1 and R.sup.2 together with the carbon atom and the nitrogen atom to which they are bound form a 5- to 8- link ring which also may contain a sulfur heteroatom or a carbonyl group and which where called for may be substituted with one to two C.sub.1 -C.sub.4 alkyl groups, each time, two of the residues R.sup.3, R.sup.4 and R.sup.5 independently of each other are a hydrogen atom, a C.sub.5 -C.sub.8 cycloalkyl group, a C.sub.1 -C.sub.12 alkyl group or an aryl group which may be substituted by one or two residues selected form a halogen atom, a nitro-, a C.sub.1 -C.sub.4 alkoxy, hydroxy, a C.sub.1 -C.sub.4 alkyl or phenoxy group, and the third of the residues R.sup.3, R.sup.4 and R.sup.5 denotes --CHO, --CO.sub.2 H, --COSC.sub.1 -C.sub.4 -alkyl or A--X, with A being a straight chain or branched C.sub.1 -C.sub.8 alkylene group which may be interrupted by a hydrogen heteroatom or a carbonyl group, or a C.sub.2 -C.sub.8 alkenyl group, and with X being CO.sub.2 H, SO.sub.3 H, CHO, OH or SH. as well as their pharmaceutically compatible salts and esters, for application in pharmacy.

In the present case the pharmaceutically compatible salts may be salts of acid or of base addition. For acid addition salts, inorganic acids such as hydrochloric acid, sulfuric acid or phosphoric acid are used, or such organic acids as tartaric acid, lactic acid, citric acid, malic acid, mandelic acid, ascorbic acid, maleic acid, fumaric acid, gluconic acid and the like.

The base salts include the salts of the compounds of formula I with inorganic bases such as sodium or potassium hydroxide or with organic bases such as mono-, di- or tri-ethanolamine.

The esters of the compounds of formula I include in particular physiologically easily hydrolyzed esters such as alkyl-, pivaloyloxymethyl-, acetoxymethyl-, phthalidyl-, indanyl- and methoxymethyl-ester.

The term "alkyl, alkoxy etc." covers straight-chain or branched alkyl groups such as methyl, ethyl, n- and i-propyl, n-, i- or t-butyl, n-pentyl, neopentyl, n-hexyl etc.

Unless otherwise stated, "alkyl" preferably shall denote C.sub.1 -C.sub.8 alkyl and in particular C.sub.1 -C.sub.6 alkyl.

Preferably aryl shall denote naphthyl and in particular phenyl.

The expression "halogen atom" covers an atom of fluorine, chlorine, bromine or iodine, especially a fluorine or chlorine atom.

The cyclo-alkyl residue preferably denotes a cyclopentyl or cyclohexyl residue.

A preferred embodiment mode are compounds of the formula Ia: ##STR3## where R.sup.3, R.sup.4 and R.sup.5 are the same as stated above in relation to formula I and where R.sup.6 and R.sup.7 independently from one another denote a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group.

Especially preferred compounds of formula Ia are those wherein two of the residues R.sup.3, R.sup.4 and R.sup.5 denote a phenyl group which is possibly substituted by one or two residues selected from a halogen atom, in particular a fluorine or chlorine atom, from a C.sub.1 -C.sub.4 alkyl-, C.sub.1 -C.sub.4 alkoxy-, hydroxy- and phenoxy-group and where the third residue denotes A--X, with A being a C.sub.2 -C.sub.8 alkylene group or a C.sub.1 -C.sub.8 alkenylene group, and with X being CO.sub.2 H.

In particular AX denotes C.sub.2 -C.sub.6 -alkylene-CO.sub.2 H or C.sub.2 -C.sub.6 -alkenylene--CO.sub.2 H and in an especially preferred instance it stands for (CH.sub.2).sub.2 CO.sub.2 H, CH.sub.2 CO.sub.2 H or CH.dbd.CH CO.sub.2 H.

Preferably R.sup.6 and R.sup.7 are in the 2-position of the pyrrolizine structure and in particular they designate both a hydrogen atom or a methyl group.

Especially preferred embodiment modes are the compounds of the formulas ##STR4## where R.sup.6 and R.sup.7 denote a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group and R.sup.3 and R.sup.4 denote a phenyl group which may be substituted by one or two residues which are selected from a halogen atom, a nitro-, C.sub.1 -C.sub.4 alkoxy-, C.sub.1 -C.sub.4 alkyl- or a phenoxy-group. A--X has the same meaning as above in relation to the formula I.

Preferably the substituents of the phenyl group are selected from a halogen atom, in particular a fluorine or chlorine atom, from a C.sub.1 -C.sub.4 alkyl-, C.sub.1 -C.sub.4 alkoxy- and phenoxy-group. Preferably the substituents shall be in the m- and/or in the p-position.

Preferably A denotes a C.sub.2 -C.sub.8 alkylene group or a C.sub.1 -C.sub.8 alkenylene group in particular, or a C.sub.2 -C.sub.6 alkylene- or C.sub.2 -C.sub.6 alkenylene group and X preferably denotes CO.sub.2 H.

Another embodiment mode are the compounds of formula I

where R.sup.1 and R.sup.2 independently of one another denote a C.sub.1 -C.sub.12 group, with two of the residues R.sup.3, R.sup.4 and R.sup.5 being a phenyl group possibly substituted by one or two residues selected from a halogen atom, a C.sub.1 -C.sub.4 alkyl-, C.sub.1 -C.sub.4 alkoxy-, hydroxy- and phenoxy-group, and where the third of the residues R.sup.3, R.sup.4 and R.sup.5 is a hydrogen atom or A--X, with A being a C.sub.1 -C.sub.6 alkylene- or a C.sub.2 -C.sub.6 alkenylene-group and X being CO.sub.2 H or SO.sub.3 H.

R.sup.1 preferably is a C.sub.1 -C.sub.8 alkyl group, in particular a C.sub.1 -C.sub.6 alkyl group and especially preferred a C.sub.4 -C.sub.6 alkyl group.

R.sup.2 preferably is a C.sub.1 -C.sub.4 alkyl group and especially a methyl group.

R.sup.3 and R.sup.4 on one hand and R.sup.4 and R.sup.5 on the other preferably are a phenyl group and R.sup.5 and R.sup.3 resp. are A--X, with A being preferably a C.sub.1 -C.sub.4 alkylene group or a C.sub.2 -C.sub.6 alkenylene group. Especially preferred compounds are:

(2,2-dimethyl-6,7-diphenyl-2,3-dihydro-1H-pyrrolizine-5-yl)-acetic acid, and 3-(2,2-dimethyl-6-(4-phenoxyphenyl)-7-phenyl-2,3-dihydro-1H-pyrrolizine-5-yl) propionic acid.

Further the invention concerns the compounds of the general formula I and also the corresponding above stated preferred embodiment modes per se, where R.sup.1 and R.sup.2 together denote a 5 to 8 link ring possibly containing a sulfur hetero-atom or a carbonyl group and further possibly substituted with one to two C.sub.1 -C.sub.4 alkyl group, and where R.sup.3, R.sup.4 and R.sup.5 assume the above meanings but with A being a straight-chain or a branched C.sub.3 -C.sub.8 alkylene group which may be interrupted by an oxygen atom or a carbonyl group, or denoting a straight-chain or a branched C.sub.3 -C.sub.8 alkenyl group, or

where R.sup.1 through R.sup.5 assume the meanings stated in claim 4.

Synthesis of the compounds of formula I where R.sup.1 and R.sup.2 together form a 5 to 8 link ring, takes place in a first step described by the equation (1) below: ##STR5##

This synthesizing step is elucidated together with the following ones by means of the illustrative diphenyl-substituted pyrrolizine compounds. The first reaction stage is explained in further detail below: ##STR6##

The conditions of reaction are known and described in CHEMIKER-ZEITUNG, 110, (1968) #7/8, pp 267, 271 and in ARCH. PHARM. 321, pp 159-162 (1988).

In a second stage, the formyl or methylol group is introduced into the pyrrole ring and further reaction takes place into the corresponding derivatives of acetic acid and ethanol rep. as given by the reaction diagram (2) below: ##STR7##

These reactions and their conditions are known and are described in CHEMIKER-ZEITUNG 110 (1968), #7/8, pp 267-271 and in ARCH. PHARM. 321, pp 159-162 (1988).

The preparation of the corresponding derivatives of formic acid, propionic acid and acrylic acid is described in ARCH. PHARM. 321, pp 545-549. It takes place according to the reaction diagrams (3) and (4).

The preparation of the corresponding butyric-acid derivatives takes place according to the reaction diagram (5). First, using the Friedels-Crafts acylation with succinic acid anhydride (E. Berlina, ORG. REAKT. 1949, 5, pp 229-289), the 4-oxobutyric acids are prepared which then are reduced by means of the Huang-Minlon variation of the Wolff-Kishner reduction with hydrazine/KOH in deithyleneglycol. The conditions of reaction are known to the expert.

The derivatives of valeric acid can be prepared by means of the 5-oxovaleric acids which in turn can be made from the pyrrolizine base bodies by the Friedel-Crafts acylation with glutaric acid anhydride in a manner similar to the preparation of the butyric acid derivatives. In similar manner the caproic acid derivatives are obtained by the Friedel-Crafts acylation of diphenylpyrrolizine with methyl-5-(chloroformylvalerate/AlCl.sub.3) and saponification of the 6-oxocaproic-acid-methylester derivatives and subsequent reduction of the oxovaleric acid with hydrazine/KOH.

The preparation of compounds substituted at the phenyl group takes place similarly. The hydroxy-substituted derivatives are prepared by ether splitting with BBr.sub.3 from the corresponding alkoxy derivatives (TETRAHEDRON, 1968, 24, pp 2289-2292). ##STR8##

The preparation of the compounds of formula I is described below, wherein R.sup.1 and R.sup.2 denote a C.sub.1 -C.sub.12 alkyl group. The initial material for the synthesis of these compounds are the corresponding 2,3,4- and 2,3,5-substituted pyrrole compounds of which the production is described in AUST. J. CHEM. 1966, 19, pp 1971-1885. The further synthesizing steps are elucidated illustratively below starting with 2-methyl-2,3-diphenylpyrrole and 5-methyl-2,3-diphenylpyrrole. These reactions are shown in the diagrams (6) and (7).

The first step is an alkylation of the pyrrole nitrogen atom. This reaction is carried out in conventional manner, for instance using the corresponding alkyl halides in the presence of a base, for instance alkali-metal alcoholates such as sodium methylate, sodium ethylate or potassium-t-butylate, in an inert solvent such as DMSO, ethyleneglycol methylether and the like. The alkylation also can be carried out heterogeneously with the corresponding toluene sulfonic-acid alkylesters or alkyl halides using phase transfer catalysts, in conventional manner (see for instance CAN. J. CHEM. 1977, 55, pp 4112-4116). The introduction of acid lateral chains then takes place similarly to the synthesises of the corresponding pyrrolizinyl carboxylic acids as described above.

The compounds of the invention are potent inhibitors of cyclo-oxygenase and/or lipoxygenase. Accordingly they are useful in treating the set of rheumatic illnesses and in preventing allergically induced ailments. Therefore the compounds of the invention represent effective antiphlogistics, analgetics, antipyretics, anti-allergics and broncholytics and may be used in thrombosis prophylaxis and in the prophylaxis of anaphylactic shock and to treat skin diseases such as psoriasis, urticaria, acute and chronic exanthemas of allergic and non-allergic origins. ##STR9##

The compounds of the invention may be administered either as individual therapeutic substances or as mixtures with other active substances. They may be administered alone, but as a rule they may be administered in the form of drugs, that is as mixtures of the active substances with suitable pharmaceutical carriers or diluents. The compounds or drugs may be administered orally or parenterally but preferably they shall be dosed orally.

The kind of drug and of pharmaceutical carrier or diluent depends on the desired method of administration. Oral drugs for instance may be in the form of tablets or capsules and may contain conventional excipients such as binders (for instance syrup, acacia, gelatin, sorbite, traganth gum or polyvinylpyrrolidone), fillers (for instance lactose, sugar, maize starch, calcium phosphate, sorbite or glycine), lubricants (for instance magnesium stearate, talcum, polyethyleneglycol or silicon dioxide), disintegrates (for instance starch) or wetting agents (for instance sodium lauryl sulfate). Oral liquid preparations may be in the form of aqueous or oily suspensions, solutions, emulsions, syrups, elixirs or sprays etc. or they may be in the form of dry powders to be reconstituted with water or another suitable carrier. Such liquid preparations may contain conventional additives such as suspending agents, flavorings, diluents or emulsifiers. As regards parenteral administration, solutions or suspensions with conventional pharmaceutical carriers may be used.

The compounds or drugs of the invention can be administered to mammals (human and animal) in doses of about 0.5 mg to about 100 mg per kg of body weight per day. They can be administered in single or multiple doses.

The effectiveness of the compounds of the invention can be determined by means of the inhibition of 5-lipoxygenase or of cyclo-oxygenase. The research was carried out as follows:

TESTING TO DETERMINE THE INHIBITION OF 5-LIPOXYGENASE

The source for 5-lipoxygenase were bovine granulocytes which can form leucotrienes just as human granulocytes do. By stimulation with calcium-ionophore (see BIOCHEM. BIOPHYS. ACTA 1984, 795, pp 499-503), mainly LTC.sub.4 (leucotriene C.sub.4) and LTB.sub.4 (leucotriene B.sub.4) are formed from endogenous arachidonic acid. The isolation of the granulocytes and the implementation of the enzyme reaction are conventional (see BIOCHEM. BIOPHYS. ACTA 1984, 795 pp 499-503). The blood protected against clotting by EDTA first is centrifuged for that purposed and the thrombotic excess is removed. Following lysis of the erythrocytes with water the lymphocytes and monocytes are separated from the granulocytes by means of a Ficoll gradient. The granulocytes are set to a specific cell number. The enzyme reaction is then begun in the presence or absence of the test substances following the addition of Ca.sup.2+ with calcium ionophore. The synthesis of the leucotrienes is stopped after 5 minutes by adding a mixture of methanol and acetonitrile containing PGB2 as the internal standard and NDGA as the anti-oxidant. Next the samples are diluted in water and processed in the manner described in J. CHROMATOGR. 1896, 378, pp 208-214. LTB.sub.4 is measured at the absorption maximum at 270 nm. The arachidonic acid metabolites are observed present in this research in approximately quantitative manner.

TESTING TO DETERMINE THE INHIBITION OF CYCLO-OXYGENASE

In this test the 12-HHT amount of 12-hydroxyheptadecatriene acid or prostaglandin E.sub.2 amount formed by bovine thrombocytes following addition of calcium ionophore is determined by uv detection following HPLC separation. Following centrifuging of the bovine blood, the thrombocytes are isolated from the surnatant. The enzyme reaction and the isolation of the formed metabolites take place as when determining the 5-lipoxygenase inhibition, however the incubation time was one minute. The detection of 12 HHT following HPLC separation takes place at 232 nm.

Tables 1 and 2 list the test results for the compounds of the invention, The test substances were at concentrations of 10 .mu.M.

The Examples below illustrate the invention. All temperatures are uncorrected. The ir spectra--unless noted otherwise--are from KBr molded articles. The NMR spectra, unless noted otherwise, are 90 Mhz spectra, recorded in CDCl.sub.3 with tetramethylsilane (TMS) as the internal standard.

The preparation and the properties of the compounds used as initial materials used in part for the reactions below and listed in Tables 3, 4 and 5 are described in the following literature:

ARCH. PHARM. 312, pp 896-907 (1979)

ARCH. PHARM. 319, pp 500-505 (1986)

ARCH. PHARM. 321, pp 159-162 (1988)

ARCH. PHARM. 321, pp 545-549 (1988)

CHEMIKER ZEITUNG, 110, (1986), 7/8, pp 267-271.

TABLE 1__________________________________________________________________________INHIBITION OF 5-LIPOXYGENASE AND OF CYCLO-OXYGENASEBY PYRROLIZINE COMPOUNDS. ##STR10## INHIBITION %COMPOUND Lipoxy- Cyclooxy-Nr. R.sup.3 R.sup.4 R.sup.5 R.sup.6 R.sup.7 genase genase__________________________________________________________________________ Phenyl (CH.sub.2).sub.4 CO.sub.2 H Phenyl H H 82 Phenyl (CH.sub.2).sub.5 CO.sub.2 H Phenyl H H 80 (CH.sub.2).sub.4 CO.sub.2 H Phenyl Phenyl H H 86 (CH.sub.2).sub.5 CO.sub.2 H Phenyl Phenyl H H 86 Phenyl Phenyl CH.sub.2 CO.sub.2 H CH.sub.3 CH.sub.3 94 99 Phenyl Phenyl (CH.sub.2).sub.2 CO.sub.2 H CH.sub.3 CH.sub.3 91 97 (CH.sub.2).sub.2 CO.sub.2 H Phenyl Phenyl CH.sub.3 CH.sub.3 93 (CH.sub.2).sub.5 CO.sub.2 H Phenyl Phenyl CH.sub.3 CH.sub.3 96 Phenyl Phenyl CH.sub.2 CO.sub.2 H H H 91 Phenyl Phenyl CHCHCO.sub.2 H H H 80 CHCHCO.sub.2 H Phenyl Phenyl CH.sub.3 CH.sub.3 91 Phenyl C.sub.6 H.sub.13 CHCHCO.sub.2 H H H 82 Phenyl m-Chlorphenyl (CH.sub.2).sub.2 CO.sub.2 H H H 89 Phenyl p-Chlorphenyl (CH.sub.2).sub.2 CO.sub.2 H H H 98 Phenyl p-Tolyl (CH.sub.2).sub.2 CO.sub.2 H H H 92 Phenyl p-Methoxy- (CH.sub.2).sub.2 CO.sub.2 H H H 91 phenyl Phenyl p-Phenoxy- (CH.sub.2).sub.2 CO.sub.2 H H H 98 70 phenyl Phenyl .alpha.-naphthyl (CH.sub.2).sub.2 CO.sub.2 H H H 94 Phenyl p-Fluorphenyl (CH.sub.2).sub.2 CO.sub.2 H CH.sub.3 CH.sub.3 93 (3,3 .mu.M) Phenyl p-Tolyl (CH.sub.2).sub.2 CO.sub.2 H CH.sub.3 CH.sub.3 93 (3,3 .mu.M) Phenyl p-Phenoxy- (CH.sub.2).sub.2 CO.sub.2 H CH.sub.3 CH.sub.3 98 phenyl (3,3 .mu.M)__________________________________________________________________________ TABLE 2______________________________________INHIBITION OF 5-LIPOXYGENASE BY 2-METHYL-DIPHENYLPYRROLE-ACETIC-ACIDS ##STR11## INHIBITION (%)R.sup.1 R.sup.2 R.sup.3 R.sup.4 R.sup.5 (Lipoxygenase)______________________________________n-C.sub.4 H.sub.9 CH.sub.3 Phenyl Phenyl (CH.sub.2).sub.2 CO.sub.2 H 94n-C.sub.5 H.sub.11 CH.sub.3 Phenyl Phenyl (CH.sub.2).sub.2 CO.sub.2 H 99n-C.sub.6 H.sub.13 CH.sub.3 Phenyl Phenyl (CH.sub.2).sub.2 CO.sub.2 H 99Neo- CH.sub.3 Phenyl Phenyl (CH.sub.2).sub.2 CO.sub.2 H 97pentyl______________________________________ TABLE 3______________________________________ ##STR12##EXAMPLE R' =Nr. R H CH.sub.3______________________________________1 H 1a 1b2 CHO 6a 6b3 CH.sub.2 OH 9a 9b4 CH.sub.2 COOC.sub.2 H.sub.5 12a 12b5 (CH.sub.2).sub.2 OH 15a 15b6 COOH 18a 18b7 CH.sub.2 COOH 23a 23b8 (CH.sub.2).sub.2 COOCH.sub.3 26a 26b9 (CH.sub.2).sub.2 COOH 27a 27b10 CHCHCOOC.sub.2 H.sub.5 (E) 3011 CHCHCOOH (E) 33______________________________________ TABLE 4______________________________________ ##STR13##EXAMPLE R' =Nr. R H CH.sub.3______________________________________12 H 2a 2b13 CHO 7a 7b14 CH.sub.2 OH 10a 10b15 CH.sub.2 COOC.sub.2 H.sub.5 13a 13b16 (CH.sub.2).sub.2 OH 16a 16b17 COSC.sub.2 H.sub.5 19a 19b18 COOH 21a 21b19 CH.sub.2 COOH 24a 24b20 CHCHCOOC.sub.2 H.sub.5 (E) 2821 CHCHCOOH (E) 3022 (CH.sub.2).sub.2 COOH 32______________________________________ TABLE 5______________________________________ ##STR14##EXAMPLE R' =Nr. R H CH.sub.3______________________________________23 H 3a 3b24 CHO 8a 8b25 CH.sub.2 OH 11a 11b26 CH.sub.2 COOC.sub.2 H.sub.5 14a 14b27 (CH.sub.2).sub.2 OH 17a 17b28 COSC.sub.2 H.sub.5 20a 20b29 COOH 22a 22b30 CH.sub.2 COOH 25a 25b31 CHCHCOOC.sub.2 H.sub.5 (E) 29a 29b32 CHCHCOOC.sub.2 H.sub.5 (Z) 29b'33 CHCHCOOH (E) 31a 31b34 CHCHCOOH (Z) 31b'35 (CH.sub.2).sub.2 COOH 33a 33b______________________________________

GENERAL PROCEDURE FOR PREPARING THE 4-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL)-4-OXOBUTYRIC ACIDS

With ice cooling and stirring, 8.8 mmoles (1.17 g) of AlCl.sub.3 are added in batches over five minutes to a solution of 4 mmoles of diphenyl-2,3-dihydro-1H-pyrrolizine and 4 mm (0.40 g) of succinic acid anhydride. Then agitation continues for 45 minutes at room temperature. Thereupon the batch is poured into 150 ml ice water. After adding 4 ml of 8% H.sub.3 PO.sub.4, extraction is performed three times with CHCl.sub.3, the organic phases are dried with Na.sub.2 SO.sub.4 and the solvent is distilled. Product isolation is by means of column chromatography (silica gel, 1st ether, 2nd ether/THF 1+1). The product fractions are concentrated, the residue is dissolved in a little CHCl.sub.3. After adding n-hexane and new concentration, the product is precipitated.

GENERAL PROCEDURE FOR PREPARING THE 4-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL)-BUTYRIC ACIDS

0.5 mmoles of 4-(diphenyl-2,3-dihydro-1H-pyrrolizinyl)-4-oxobutyric acid are mixed with 10 ml of diethyleneglycol, 50 mmoles (2.8 g) of KOH and 30 mmoles (1.5 g) of hydrazine hydrate. The batch is heated 1 hour till reflux (bath temperature 170.degree. C.). Next the reflux condenser is replaced by a distillation bridge and the temperature is raised until the inside is at about 210.degree. C. This temperature is then maintained for 2 h. Following cooling, the batch is poured into 150 ml H.sub.2 O, acidified with 8% H.sub.3 PO.sub.4 and extraction is carried out three times with ether. The extracts are washed with H.sub.2 O, dried and concentrated. The product is isolated with column chromatography (silica gel, ether/THF 4+1 in 39, diisopropylether in 40, ether in 41a and ether/n-hexane 4+1 in 41b) and is precipitated using n-hexane.

GENERAL PROCEDURE FOR PREPARING THE 5-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL)-5-OXOVALERIC ACIDS

4 mmoles of diphenyl-2,3-dihydro-1H-pyrrolizine are reacted in 16 ml of absolute CH.sub.2 Cl.sub.2 with 4 mmoles (0.46 g) of glutaric acid anhydride and 8.8 mmoles (1.17 g) of AlCl.sub.3 similarly to the procedure for making the 4-(diphenyl-2,3-dihydro-1H-pyrrolizinyl)-4-oxobutyric acid ("s.S." 222). In deviation, the batch is poured into ice water immediately after the addition of AlCl.sub.3 and then is processed further. Product purification takes place by column chromatography (silica gel/ether).

GENERAL PROCEDURE FOR PREPARING THE 5-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL)-5-VALERIC ACIDS

0.5 mmoles of 5-(diphenyl-2,3-dihydro-1H-pyrrolizinyl)-5-oxovaleric acids are reacted similarly to the procedure for making the 4-(diphenyl-2,3-dihydro-1H-pyrrolizinyl)-4-oxobutyric acids. The produce is isolated by column chromatography (silica gel, ether) and precipitated by means of n-hexane.

GENERAL PROCEDURE FOR PREPARING THE 6-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL)-6-OXOCAPROIC-ACID METHYLESTERS

With ice cooling and while stirring, 22 mmoles (2.93 g) of AlCl.sub.3 are added over 5 minutes and in batches to the solution of 10 mmoles of diphenyl-2,3-dihydro-1H-pyrrolizine and 10 mmoles (1.79 g) of methyl-5-(chloroformyl)-valerate in 50 ml of absolute CH.sub.2 Cl.sub.2. Immediately thereafter the batch is poured into 150 ml of ice-cooled 10% NaCl solution. Upon addition of 4 ml of 8% H.sub.3 PO.sub.4, extraction with ether is carried out three times, the organic phases are dried with Na.sub.2 SO.sub.4 and the solvent is distilled. The product is isolated by means of column chromatography (silica gel, 1st n-hexane/ether 3+2, 2nd n-hexane/ether 1+4 in 48, 50a and 50b, or 1st toluene, 2nd hexane/ether 1+4 in 49). First the eluates are concentrated to about 100 ml, then they are washed twice with 0.05 n NaOH and twice with 10% NaCl solution and lastly they are dried with Na.sub.2 SO.sub.4. When the solution is concentrated the products precipitate or, following distillation of the solvent, crystallize.

GENERAL PROCEDURE FOR PREPARING THE 6-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL)-6-CAPROIC ACIDS

The solution of 1 mmole of 6-(diphenyl-2,3-dihydro-1H-pyrrolizinyl)-6-oxocaproic-acid methylester in 10 ml of ethanol is heated to boiling. 5 ml of 10% KOH previous degassed by boiling are dripped into that solution and heating continues another 15 minutes with reflux. Following cooling the batch is poured into 100 ml of 5% NaCl and then is acidified with 8% H.sub.3 PO.sub.4 and extraction is carried out three times with ether. The organic phases are dried by means of Na.sub.2 SO.sub.4 and concentrated. The residue is reacted with 50 mmoles (2.8 g) of KOH and 30 mmoles (1.5 g) of hydrazine hydrate in 10 ml of diethylene glycol similarly to the preparation procedure for the 4-(diphenyl-2,3-dihydro-1H-pyrrolizinyl)-butyric acids and is purified by column chromatography with silica gel.

The compounds so prepared and several physical properties of theirs are listed in the Tables 6 through 8 below.

GENERAL PROCEDURE FOR PREPARING THE 2-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL)-PROPIONIC-ACID ETHYLESTERS

5 mmoles of diphenyl-2,3-dihydro-1H-pyrrolizine dissolved in 4 ml of absolute toluene are reacted with 7.5 mmoles (0.96 g) of 2-diazopropionic-acid ethylester dissolved in 2 ml of absolute toluene similarly to the procedure for preparing the diphenyl-2,3-dihydro-1H-pyrrolinyl acetic-acid ethylesters. However the time of reaction is 2 h. Purification is column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 9+1). The products are precipiated with ethanol.

GENERAL PROCEDURE FOR SAPONIFYING THE 2-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL) PROPIONIC-ACID ETHYLESTERS

5 mmoles of 54 or 0.5 mmoles of 55a and 55b, dissolved in 12 ml or 9 ml resp. of ethanol are reacted with 8 ml or 2.5 ml resp. of 10% aqueous KOH similarly to the procedure for saponifying the diphenyl-2,3-dihydro-1H-pyrrolizinyl-acetic-acid ethylesters. The time of saponification is 15 min in 54, 60 min in 55a, and 55b. Purification is by column chromatography (silica gel, 1st n-hexane/ether 1+1, 2nd ether). After the eluates have been concentrated, the products are precipitated with n-hexane.

The compounds so prepared together with some of their properties are listed in Table 6 and the Table 9.

TABLE 6______________________________________ ##STR15## MELTINGEXAMPLE POINTNr. R .degree.C. IR.sup.1)______________________________________36 CO(CH.sub.2).sub.2 COOH 36 187-188 1710, 163537 (CH.sub.2).sub.3 COOH 39 166-167 170538 CO(CH.sub.2).sub.3 COOH 42 142-143 1710, 163539 (CH.sub.2).sub.4 COOH 45 146 171040 CO(CH.sub.2).sub.4 COOH 48 99 1740, 163041 (CH.sub.2).sub.5 COOH 51 -- *42 CH(CH.sub.3)COOC.sub.2 H.sub.5 54 -- 173043 CH(CH.sub.3)COOH 56 173 1705______________________________________ .sup.1) (CO) Band *.sup.1 H-NMR: .delta.(ppm) = 1.06-1.78(m, 6H, (CH.sub.2).sub.3CH.sub.2CO), 2.10-2.40(m, 2H, CH.sub.2CO), 2.40-2.76(m, 4H, PyrCH.sub.2 and C2), 3.02(t, 2H, J=7Hz, C1), 3.94(t, 2H, J=7Hz, C3), 6.97-7.31(m, 10H, Arom.) TABLE 7______________________________________ ##STR16## MELTINGEXAMPLE POINTNr. R .degree.C. IR.sup.1)______________________________________44 CO(CH.sub.2).sub.2 COOH 37 231-234 1715, 168045 (CH.sub.2).sub.3 COOH 40 176-178 171546 CO(CH.sub.2).sub.3 COOH 43 128 1710, 166047 (CH.sub.2).sub.4 COOH 46 126-127 170048 CO(CH.sub.2).sub.4 COOCH.sub.3 49 112 1745, 165.beta.49 (CH.sub.2).sub.5 COOH 52 63 1710______________________________________ .sup.1) (CO) Band TABLE 8__________________________________________________________________________ ##STR17##EXAMPLE R' = MELTING PT. .degree.C. IR.sup.1)Nr. R H a b a b__________________________________________________________________________50 CO(CH.sub.2).sub.2 COOH 38a 38b 190-191 187-188 1715, 1665, 1715, 1645 164551 (CH.sub.2).sub.3 COOH 41a 41b 146-148 192-194 1705 171052 CO(CH.sub.2).sub.3 COOH 44a 44b 109 167 1720, 1660 1715, 166053 (CH.sub.2).sub.4 COOH 47a 47b 111-112 1705 129-130 171554 CO(CH.sub.2).sub.4 COOCH.sub.3 50a 50b 92 1735, 1645 1740, 165555 (CH.sub.2).sub.5 COOH 53a 53b 123 1710 122 1710__________________________________________________________________________ .sup.1) (CO) Band TABLE 9__________________________________________________________________________ ##STR18##EXAMPLE R' = MELTING PT. IR (CO)Nr. R H CH.sub.3 a b a b__________________________________________________________________________56 CH(CH.sub.3)COOC.sub.2 H.sub.5 55a 55b 133 136 1730 174057 CH(CH.sub.3)COOH 57a 57b 190 1705 226 1710__________________________________________________________________________

EXAMPLE 58

5-(1-(DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-7-YL)-ETHYL)-2,3-DIMETHYL-1,3-DIOXAN-4,6-DIONE (59a)

The solution of 4 mmoles (1.04 g) of 3a, 4 mmoles (0.58 g) of 2,2-dimethyl-1,3-dioxan-4,6-dione (Meldrum's acid) and 8 mmoles (0.35 g) of freshly distilled acetaldehyde in 40 ml of acetonitrile is made to stand for 24 h at 30.degree. C. Following cooling in the ice bath, the precipitated product is evacuated.

Yield: 0.44 g (26%).

melting point: 169.degree. C. (with dissociation).

IR: .nu..sub.max =1790 (C.dbd.O), 1605 (C.dbd.C)/cm.

EXAMPLE 59

5-(1-(2,3-DIMETHYL-5,6-DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-7-YL)ETHYL)-2,2-DIMETHYL-1,3-DIOXAN-4,6-DIONE (59b)

4 mmoles (1.15 g) of 3b are reacted in the manner described in relation to 59a with acetaldehyde and Meldrum's acid.

Yield: 1.35 g (74%).

Ir: .nu..sub.max =1790 (C.dbd.O), 1755 (C.dbd.O), 1605 (C.dbd.C)/cm.

EXAMPLE 60

3-(5,6-DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-7-YL) BUTYRIC-ACID ETHYLESTERS (60a)

1 mmole of 59a is dissolved in a mixture of 5 ml of absolute pyridine and 1.0 ml of absolute ethanol. After adding some copper powder, the batch is heated to reflux for 3 h. The copper power is evacuated and the solvent is distilled in vacuum. The product is isolated from the residue by column chromatography (silica gel, n-hexane/CH.sub.2 Cl.sub.2 1+2).

Yield: 96.5 mg (25%).

IR: .nu..sub.max =1735 (C.dbd.O), 1605 (C.dbd.C)/cm.

EXAMPLE 61

3-(2,3-DIMETHYL-5,6-DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-7-YL)BUTYRIC-ACID ETHYLESTER (60b)

2.5 mmoles of 59b are dissolved in a mixture of 20 ml absolute pyridine and 2 ml of absolute ethanol and upon addition of some copper powder the batch is reacted as described for 60a. Purification is by column chromatography (silica gel, n-hexane/CH.sub.2 Cl.sub.2 2+1) in isolation.

Yield: 0.68 g (68%).

IR: .nu..sub.max =1745 (C.dbd.O), 1605 (C.dbd.C)/cm.

EXAMPLE 62

3-(5,6-DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-7-YL)-BUTYRIC ACID (61a)

The eluates are concentrated. The product is made to crystallize using a little ether and then is made to precipitate extensively by adding n-hexane.

Yield: 63 mg (36%).

Melting point: 157.degree. C. (with dissociation).

IR .nu..sub.max =3300-2400 (OH), 1710 (C.dbd.O), 1605 (C.dbd.C)/cm.

EXAMPLE 63

3-(2,2-DIMETHYL-5,6-DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-7-YL) BUTYRIC-ACID (61b)

The product precipitates when the eluates are concentrated.

Yield: 0.26 g (46%).

Melting point: 202.degree.-208.degree. C. (with dissociation).

GENERAL PROCEDURE FOR PREPARING THE TRIMETHYLPHENYL-2,3-DIHYDRO-1-H-PYRROLIZINES

0.05 moles (5.6 g) of 2,4,4-trimethyl-.DELTA.1pyrroline, dissolved in 25 ml of absolute ethanol, are reacted with 0.05 moles (10.7 g) of 1-bromo-1-phenylacetone (in 63) or .alpha.-bromo-propiophenone (in 64) in a manner analogous to the synthesis of 3a. In deviation from that reference, here, following addition of the NaHCO.sub.3 solution (0.06 moles in 40 ml of H.sub.2 O) are heated only 4 h to reflux. Purification is carried out by means of column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 9+1). Oil remains following concentration of the eluate.

GENERAL PROCEDURE FOR PREPARING THE TRIMETHYLPHENYL-2,3-DIHYDRO-1H-PYRROLIZINYL-ACETIC-ACID ETHYLESTERS

5 mmoles (1.13 g) of 63 or of 64, dissolved in 5 ml of absolute toluene, are reacted with 7.5 mmoles (0.86 g) of diazo-acetic-acid ethylester dissolved in 4 ml of absolute toluene similarly to the procedure for preparing the diphenyl-1,2,3-dihydro-1H-pyrrolizinyl acetic-acid ethylesters. The products are obtained as oils following column chromatography (Al.sub.2 O.sub.3, 1st n-hexane/ether 9+1, 2nd n-hexane/ether 3+2).

SAPONIFICATION OF THE TRIMETHYLPHENYL-2,3-DIHYDRO-1H-PYRROZINYL-ACETIC-ACID ETHYLESTERS

1.5 mmoles of 65 or 0.5 mmoles of 66, dissolved in 4 ml or 12 ml resp. of ethanol are reacted with 2.5 ml or 7.5 ml resp. of 10% aqueous KOH similarly to the procedure for saponifying the diphenyl-2,3-dihydro-1H-pyrrolinyl-acetic-acid ethylesters. Purification is by column chromatography.

The compounds and several of their properties are listed in the Tables 10 and 11 below.

TABLE 10______________________________________ ##STR19##EXAMPLENr. R MELTING PT. IR.sup.1)______________________________________64 H 63 -- 160565 CH.sub.2 COOC.sub.2 H.sub.5 65 -- 173566 CH.sub.2 COOH 67 168 1715______________________________________ TABLE 11______________________________________ ##STR20##R MELTING PT. IR.sup.1)______________________________________67 H 64 58-60 1595 (CC)68 CH.sub.2 COOC.sub.2 H.sub.5 66 174069 CH.sub.2 COOH 68 141 1710______________________________________ .sup.1) (CO) band, unless stated otherwise

EXAMPLE 70

5-(n-HEXYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE (69)

In order to dissolve 35 mmoles of n-octanal in 15 ml of ether and 5 ml of dioxan, a solution of 35 mmoles (5.6 g) of bromine in 5 ml of CH.sub.2 Cl.sub.2 is slowly added while stirring. This batch then is mixed with 50 ml ether and to neutralize HBr, the mixture is washed carefully twice with a 5% NaHCO.sub.3 solution. The organic phase is dried by means of Na.sub.2 SO.sub.4 and concentrated. The residue is dissolved in 50 ml ethanol and added to a mixture of 30 mmoles of 2 benzyl-.DELTA.1-pyrroline.sup.99, 50 ml of ethanol and 50 ml of 10% NaHCO.sub.3 solution. After stirring for 24 at room temperature, the batch is poured into 500 ml of 10% NaCl and extraction is carried out twice with ether. The organic phases are dried by means Na.sub.2 SO.sub.4, the solvent is distilled and the pyrrolizines so obtained, 69 and 70, are isolated by column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 9+1).

The two isomeric pyrrolizines then are dissolved in 50 ml of dichloroethane and are mixed a total of four times, 15 minutes apart, each time with 17 mmoles of acrylic-acid methylester and 1.0 ml of BF.sub.3 etherate. Following addition of 200 ml of 5% NaCl solution, the batch is extracted twice with ether. Following drying by means of Na.sub.2 SO.sub.4 The solvent is distilled and the unconverted 69 is isolated by means of column chromatography (Al.sub.2 O.sub.3 n-hexane/ether 9+1). The eluates are concentrated. The remaining oil solidifies after some time.

Yield: 1.23 g (16%).

Melting point: 46.degree.-47.degree. C.

C.sub.19 H.sub.25 N (224.1).

IR: .nu..sub.max =1610 (C.dbd.C)/cm.

.sup.1 H-NMR: .delta.(ppm)=0.73-1.06 (m, 3 H, --CH.sub.3), 1.06-1.76 (m, 8 H, --CH.sub.2 --), 2.33-2.72 (m, 4 H, C-2 und Pyr--CH.sub.2 --), 3.04 (t, 2 H, J=7 Hz, C-1), 3.83 (t, 2 H, J=7 Hz, C-3), 6.20 (s, 1 H, C-5), 6.95-7.56 (m, 5 H, Arom.)

EXAMPLE 71

5-(5-(n-HEXYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-6YL)-5-OXOVALERIC ACID (71)

5 mmoles of 5-(n-hexyl)-7-phenyl-2,3-dihydro-1H-pyrrolizine 69 are reacted in 20 ml of CH.sub.2 Cl.sub.2 with 5 mmoles (0.5 g) of glutaric acid anhydride and 11 mmoles (1.47 g) of AlCL.sub.3 similarly to the procedure for preparing the 5-(diphenyl-2,3-dihydro-1H-pyrrolizinyl)-5-oxovaleric-acids. The product is purified by column chromatography (silica gel, 1st n-hexane/ether 1+1, 2nd ether). After the eluates are concentrated, 71 remains as an oil.

Yield 0.40 g (21%).

C.sub.24 H.sub.31 NO.sub.3 (381.5).

.sup.1 H-NMR: .delta.(ppm)=32 0.69-1.07 (m, 3 H, --CH.sub.3), 1.07-1.98 (m, 10 H, --CH.sub.2 --), 1.98-2.65 (m, 6 H, C-2 und --CO--CH.sub.2 --CH.sub.2 CH.sub.2 --CO--), 2.65-2.95 (m, 4 H, C-1 und Pyr--CH.sub.2 --), 3.91 (t, 2 H, J=7 Hz, C-3), 7.07-7.47 (m, 5 H, Arom.)

EXAMPLE 72

5-(5-(n-HEXYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-6YL)-VALERIC ACID (72)

1 mmole of 71 is reacted in 10 ml of diethyleneglycol with 50 mmoles (2.8 g) of KOH and 30 mmoles (1.5 g) of hydrazine hydrate similarly to the procedure for reducing the 4-(diphenyl-2,3-dihydro-1H-pyrrolizinyl)-4-oxobutyric acids. Product purification is by means of column chromatography (silica gel/diisopropylether). After concentrating the eluates, 72 remains as an oil.

Yield 0.20 g (54%).

C.sub.24 H.sub.33 NO.sub.2 (367.5).

IR: .nu..sub.max =3600-2400 (OH), 1710 (C.dbd.O), 1605 (C.dbd.C) cm.sup.-1

.sup.1 H-NMR: .delta.(ppm)=0.72-1.12 (m, 3 H, --CH.sub.3), 1.12-1.78 (m, 12 H, --CH.sub.2 --), 2.08-2.70 (m, 8 H, C-2, --CH.sub.2 --CO-- und 2x Pyr--CH.sub.2 --), 2.90 (t, 2 H, J=7 Hz, C-1), 3.87 (t, 2 H, J=7 Hz, C-3), 6.95-7.44 (m, 5 H, Arom.).

EXAMPLES 73, 74

5-(n-HEXYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-6-YL-CARBALDEHYDE (73) AND 6-(n-HEXYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL-CARBALDEHYDE (74)

35 mmoles of octanal, bromine and 2-benzyl-.DELTA.1-pyrroline are reacted each time similarly to the preparation for 69 and 70. The isolated pyrrolizines then are absorbed in 35 ml of absolute benzene and reacted with 105 mmoles (7.7 g) of absolute DMF and 35 mmoles (5.4 g) of POCl.sub.3 similarly to the procedure of the Vilsmeier formylation of the diphenyl-2,3-dihydro-1H-pyrrolizines. The two products are separated by column chromatography with silica gel, first elution taking place with n-hexane/diisopropylether 73 and then with diisopropylether 74. Both products will be in the form of oils after the eluates have been concentrated.

Proof of structure for 73: the same product is obtained in the Vilsmeier formylation of 69.

73

Yield: 1.74 g.

C.sub.20 H.sub.25 NO (295.4).

IR: .nu..sub.max =1660 (C.dbd.O), 1610 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=0.73-1.07 (m, 3 H, --CH.sub.3), 1.07-1.86 (m, 8 H, --CH.sub.2 --), 2.30-2.70 (m, 2 H, C-2), 2.74-3.05 (m, 4 H, C-1 and Pyr--CH.sub.2 --), 3.91 (t, 2 H, J=7 Hz, C-3), 7.05-7.46 (m, 5 H, Arom.), 9.87 (s, 1 H, --CHO).

74

Yield: 2.13 g.

C.sub.20 H.sub.25 NO (295.4).

IR: .nu..sub.max =1655 (C.dbd.O), 1610 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=0.68-1.01 (m, 3 H, --CH.sub.3), 1.01-1.74 (m, 8 H, --CH.sub.2 --), 2.30-2.67 (m, 2 H, C-2), 2.67-3.00 (m, 4 H, C-1 and Pyr--CH.sub.2 --), 4.32 (t, 2 H, J=7 Hz, C-3), 7.19-7.46 (m, 5 H, Arom.), 9.67 (s, 1 H, --CHO).

EXAMPLE 75

3-(6(n-HEXYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL)-ACRYLIC-ACID ETHYLESTERS (75)

5 mmoles (1.48 g) of 74 are reacted similarly to the procedure for preparing the diphenyl-2,3-dihydro-1H-pyrrolizinyl-acrylic-acid ethylesters. Purification is by column chromatography (silica gel, petroleum ether 50-70/acetic-ester 7+1). Following concentration of the eluate, the production is obtained as an oil

Yield 0.45 g (25%).

C.sub.24 H.sub.31 NO.sub.2 (365.5).

IR: .nu..sub.max =1705 (C.dbd.O), 1610 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=0.62-1.02 (m, 3 H, --CH.sub.3), 1.02-1.78 (m, 11 H, --CH.sub.2 -- und --O--CH.sub.2 --CH.sub.3), 2.23-3.01 (m, 6 H, C-2, Pyr--CH.sub.2 -- and C-1), 3.93-4.39 (m, 4 H, C-3 und --O--CH.sub.2 --), 5.89 (AB, 1 H, J=16.1 Hz, .dbd.CH--CO--), 7.04-7.48 (m, 5 H, Arom.), 7.68 (AB, 1 H, J=16.1 Hz, Pry--CH.dbd.).

EXAMPLE 76

3-(6-(n-HEXYL)-7-PHENYL-2,3-DIHYDRO-1h-PYRROLIZINE-5-YL)-ACRYLIC ACID (76)

1.0 mmole (0.37 g) of 75 is reacted similarly to the procedure for saponifying the diphenyl-2,3-dihydro-1H-pyrrolizine-acrylic-acid ethylesters.

Yield 0.20 g (59%).

Melting point: 140.degree. C. (with dissociation).

C.sub.22 H.sub.27 NO.sub.2 (337.5).

IR: .nu..sub.max 3300-2200 (OH), 1670 (C.dbd.O), 1595 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR (d.sub.6 -DMSO): .delta.(ppm)=0.58-0.96 (m, 3 H, --CH.sub.3), 0.96-1.60 (m, 8 H, --CH.sub.2 --), 2.18-2.73 (m, 4 H, C-2 and Pyr--CH.sub.2 --), 2.86 (t, 2 H, J=7 Hz, C-1), 4.15 (t, 2 H, J=7 Hz, C-3), 5.85 (AB, 1 H, J=15.8 Hz, .dbd.CH--CO--), 7.02-7.53 (m, 5 H, Arom.), 7.50 (AB, 1 H, J=15.8 Hz, Pry--CH.dbd.).

EXAMPLE 77

6-CYCLOHEXYL-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE (77)

50 mmoles of Br.sub.2, dissolved in 10 ml of CCl.sub.4, are slowly dripped into the solution of 50 mmoles (6.3 g) of cyclohexylmethylketone in 40 ml of CCl.sub.4 with stirring and shielding from light. This batch is then mixed with 50 ml of CH.sub.2 Cl.sub.2 and carefully washed twice with a 5% NaHCO.sub.3 solution to neutralize the Hbr. The organic phase is dried by means of Na.sub.2 SO.sub.4 and concentrated. The residue is dissolved in 30 ml of ethanol and reacted with the solution of 50 mmoles of 2-benzyl-.DELTA.1-pyrroline in 20 ml of ethanol. The batch is stirred for 24 h at room temperature. After adding 25 ml of a saturated NaHCO.sub.3 solution, stirring proceeds for another 24 h. Then 500 ml of 10% NaCl are added and extraction with ether is carried out twice. The organic phases are dried (Na.sub.2 SO.sub.4). The solvent is distilled and the product is isolated by column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 9+1). The oil (3.0 g) remaining after the eluate was concentrated is impure. It is further reacted without any purification.

EXAMPLE 78

6-CYCLOHEXYL-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5YL-CARBALDEHYDE (78)

3.0 g of impure 77 are dissolved in 5 ml of absolute benzene and reacted with 12 mmoles of absolute DMF (0.88 g) and 4 mmoles (0.61 g) of POCl.sub.3 similarly to the procedure for the Vilsmeier formylation of the diphenyl-2,3-dihydro-1H-pyrrolizines. Purification is by column chromatography (silica gel, ether/n-hexane 3+1). Then the product is precipitated with ethanol

Yield 0.66 g (4.5% referred to the cyclohexylmethyl ketone).

Melting point: 135.degree. C.

C.sub.20 H.sub.23 NO.sub.2 (293.4).

IR: .nu..sub.max =1645 (C.dbd.O), 1610 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.01-2.13 (m, 10 H, --CH.sub.2 -- of the cyclohexyl ring), 2.24-3.03 (m, 5 H, C-1, C-2 und Pyr--CH<), 4.35 (t, 2 H, J=7 Hz, C-3), 7.07-7.51 (m, 5 H, Arom.), 9.93 (s, 1 H, CHO).

EXAMPLE 79

3-(6-CYCLOHEXYL-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL)-ACRYLIC-ACID ETHYLESTERS (79)

2 mmoles of 78, dissolved in 4 ml of absolute CH.sub.2 Cl.sub.2, are reacted with a solution of 2 mmoles (0.86 g) of ethoxycarbonyl triphenyl phosphonium bromide in 3.5 ml of absolute ethanol and with a solution of Na-ethanolate prepared from 6 mmoles (0.14 g) of sodium and 3 ml of absolute ethanol in a manner similar to the procedure for preparing the diphenyl-2,3-dihydro-1H-pyrrolizinyl acrylic-acid ethylesters. The purification takes place by column chromatography (silica gel, petroleum ether 50-70/acetic-ester 7+2). The oil remaining after concentration solidifies after some time.

Yield: 80 mg (11%).

Melting point: 190.degree. C.

C.sub.24 H.sub.29 NO.sub.2 (363.5).

IR: .nu..sub.max =1715 (C.dbd.O), 1605 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=0.99-1.99 (m, 10 H, --CH.sub.2 -- of the cyclohexyl ring), 1.31 (t, 3 H, J=7 Hz, --O--CH.sub.2 --CH.sub.3) 2.27-2.93 (m, 5 H, C-1, C-2 und Pyr--CH<), 4.17 (t, 2 H, J=7 Hz, C-3), 4.23 (q, 2 H, J=7 Hz, --O--CH.sub.2 --), 5.85 (AB, 1 H, J=16.2 Hz, .dbd.CH--CO--), 7.04-7.48 (m, 5 H, Arom.), 7.91 (AB, 1 H, J=16.2 Hz, Pry--CH.dbd.).

EXAMPLE 80

3-(6-CYCLOHEXYL-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL)-ACRYLIC ACID (80)

0.22 mmoles (80 mg) of 79 dissolved in 5 ml of ethanol are reacted with 3 ml of 10% aqueous KOH similarly to the procedure for saponifying the diphenyl-2,3-dihydro-1H-pyrrolizine acrylic-acid ethylesters (see p 219).

Yield: 37 mg (50%).

Melting point: 201.degree. C. (with dissociation).

C.sub.22 H.sub.25 NO.sub.2 (335.4).

IR: .nu..sub.max =3200-2400 (OH), 1660 (C.dbd.O), 1585 (C.dbd.C) cm.sup.-1. .sup.1 H-NMR: .delta.(ppm)=0.98 -2.05 (m, 10 H, --CH.sub.2 -- of the cyclohexyl ring), 2.29-2.98 (m, 5 H, C-1, C-2 und Pyr--CH<), 4.21 (t, 2 H, J=7 Hz, C-3), 5.87 (AB, 1 H, J=16.0 Hz, .dbd.CH--CO--), 7.02-7.55 (m, 5 H, Arom.), 8.01 (AB, 1 H, J=16.0 Hz, Pry--CH.dbd.).

GENERAL PROCEDURE FOR THE N-ALKYLATION OF 2-METHYL-3,4-DIPHENYLPYRROLE

2 mmoles (0.47 g) of 2-methyl-3,4-diphenyl-pyrrole (AUST. J. CHEM. 1966, 19, pp 1871-1885) [and] 2.2 mmoles of p-toluene sulfonic-acid methylester (in 81b) or alkylbromide (for the remaining compounds) and 1 mmole (0.32) g) of tetrabutylammonium bromide are mixed with 10 ml ether and 5 ml of 50% aqueous NaOH. While agitating strongly, the mixture is heated for 8 h to slow boiling. Thereupon the batch is poured into 100 ml of H.sub.2 O and extracted twice with ether. The ether phases are washed with 1% H.sub.3 PO.sub.4 and H.sub.2 O, dried by means of Na.sub.2 SO.sub.4 and concentrated. The product isolation takes place by column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 9+1).

The compounds so obtained and their physical properties are listed in Table 12 below.

EXAMPLE 88

1-NEOPENTYL-2-METHYL-3,4-DIPHENYLPYRROLE (81i)

The above compound cannot be synthesized. However it may be prepared as follows:

2 mmoles (0.46 g) of 2-methyl-3,4-diphenyl-pyrrole, 2.6 mmoles of potassium-t-butylate and 3 mmoles (0.45 g) of neopentyl bromide in 6 ml of absolute DMSO are heated for 45 minutes to 130.degree.-140.degree. C. Following cooling, 100 ml H.sub.2 O are added, acidification with dilute H.sub.3 PO.sub.4 and next double extraction with ether are carried out. The ether phases are washed with H.sub.2 O, dried by means Na.sub.2 SO.sub.4, and concentrated. The product is isolated from the residue by column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 9+1) and precipitated with ethanol (similarly to the case for 81h).

Yield: 0.31 g (51%).

Melting point: 132.degree. C.

C.sub.22 N.sub.25 N (303.4) COMPUTED C 87.1 H 8.30 N 4.6.

MEASURED C 86.9 H 8.21 N 4.5.

IR: .nu..sub.max= 1605 (C.dbd.C) cm.sup.-1.

MS: m/z (rel. Int.)=303 (89%, M.sup.+), 288 (9%, M.sup.+ -CH.sub.3, 273.74), 247 (58%, M.sup.+ -C.sub.4 H.sub.8, 201.34), 246 (100%, 247-H).

.sup.1 H-NMR: .delta.(ppm)=1.02 (s, 9 H, --CH.sub.3), 2.19 (s, 3 H, Pyr--CH.sub.3), 3.66 (s, 2 H, >N--CH.sub.2 --), 6.75 (s, 1 H, C-5), 7.06-7.33 (m, 10 H, Arom.).

TABLE 12______________________________________ ##STR21##EXAMPLE MELTING POINTNr. R .degree.C. IR (CC)______________________________________.sup. 81.sup.1) CH.sub.3 81b82 C.sub.2 H.sub.5 81c 160083 n-C.sub.3 H.sub.7 81d 80 160584 n-C.sub.4 H.sub.9 81e 1610.sup. 85.sup.2) n-C.sub.5 H.sub.11 81f.sup. 86.sup.2) n-C.sub.6 H.sub.13 81g87 iso-C.sub.4 H.sub.9 81h 116 1605______________________________________ .sup.1) Tetrahedron Lett. 1969, 55, 4875-4878 Chem. Pharm. Bull. 1974, 22, 61-69 .sup.2) mixture with alkyl bromide; it is reacted without further purification

GENERAL PROCEDURE FOR PREPARING THE 3-(5-METHYL-3,4-DIPHENYLPYRROLE-2-YL)-PROPIONIC-ACID METHYLESTERS

1 mmole of 2-methyl-3,4-diphenylpyrrole or of 1-alkyl-2-methyl-3,4-diphenylpyrrole 82b-i and 1.5 mmoles (0.13 g) of acrylic-acid methylester are dissolved in 4 ml of dichloroethane. Following addition of 0.06 ml of BF.sub.3 -ethylether complex, the batch is stirred for 1 h at room temperature and after 15 minutes in each case again the same amounts of acrylic-acid methylester and BF.sub.3 -ethylester complex are added. Then the batch is mixed with 50 ml of H.sub.2 O and extraction with ether is performed twice. The ether phases are washed with H.sub.2 O, dried by means of Na.sub.2 SO.sub.4 and concentrated. The product is isolated from the residue by column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 1+4(82a) or 1+1 (82b,c) or 3+2 (remaining compounds)). After the eluate has been concentrated, an oil remains.

The compounds so obtained and several of their physical properties are listed in Table 13 below.

GENERAL PROCEDURE FOR THE SAPONIFICATION OF THE 3-5-METHYL-3,4-DIPHENYLPYRROLE-2-YL)-PROPIONIC-ACID METHYLESTERS

The solution of 0.4 mmoles of 3-(2-methyl-3,4-diphenylpyrrole-5-yl)-propionic-acid methylester 82a or 3-(1-alkyl-2-methyl-3,4-diphenylpyrrole--5-yl)-propionic-acid methylester 82b-i in 3 ml of ethanol is heated to boiling. 2 ml of 10% aqueous KOH previously degassed by boiling are dripped into the batch which then is heated with reflux for another 5 minutes. Following cooling, the batch is poured into 100 ml of 5% NaCl solution and is washed twice with 50 ml of ether. The aqueous phase is acidified with dilute H.sub.3 PO.sub.4 and extracted twice with 50 ml of ether. The ether phases are washed with 100 ml of H.sub.2 O and dried by means of Na.sub.2 SO.sub.4. The solvent is distilled, and where called for the product is precipitated with hexane.

The compounds so obtained and several of their physical properties are shown in Table 14.

TABLE 13______________________________________ ##STR22##EXAMPLENr. R IR (CO)______________________________________89 H 82a 173090 CH.sub.3 82b 174091 C.sub.2 H.sub.5 82c 174092 n-C.sub.3 H.sub.7 82d 174093 n-C.sub.4 H.sub.9 82e 174594 n-C.sub.5 H.sub.11 82f 174095 n-C.sub.6 H.sub.13 82g 174096 iso-C.sub.4 H.sub.9 82h 174097 Neopentyl 82i 1740______________________________________ TABLE 14______________________________________ ##STR23##EXAMPLE MELTING POINTNr. R .degree.C. IR (CO______________________________________ 98 H 60 1710 99 CH.sub.3 108 1710100 C.sub.2 H.sub.5 157 1715101 n-C.sub.3 H.sub.7 128 1705102 n-C.sub.4 H.sub.9 >49.degree. (dissoc.) 1715104 n-C.sub.5 H.sub.11 -- 1715105 n-C.sub.6 H.sub.13 -- 1715106 iso-C.sub.4 H.sub.9 50 1715107 Neopentyl 48 1710______________________________________

GENERAL PROCEDURE FOR THE N-ALKYLATION OF 5-METHYL-2,3-DIPHENYLPYRROLE

5 mmoles (1.17 g) of 5-methyl-2,3-diphenylpyrrole (AUST. J. CHEM. 1966, 19, pp 1871-1885), 5.5 mmoles of toluene sulfonic-acid methylester or of alkyl bromide and 1 mmole (032 g) of tetrabutyl ammonium bromide are mixed with 10 ml ether and 5 ml of 10% aqueous NaOH. The reaction henceforth is carried out in the manner of the procedure for the N-alkylation of 2-methyl-3,4-diphenylpyrrole.

The compounds so obtained and some of their physical properties are shown in Table 15.

GENERAL PROCEDURE FOR PREPARING THE (5-METHYL-4,5-DIPHENYLPYRROLE-3-YL)-ACETIC-ACID ETHYLESTERS

2.5 mmoles of methyl-2,3-diphenylpyrrole (AUST. J. CHEM. 1966, 19, pp 1871-1885) or of 1-alkyl-5-methyl-2,3-diphenylpyrrole 84b-j, dissolved in 2 ml of absolute toluene, are reacted similarly to the procedure for preparing the diphenyl-2,3-dihydro-1H-pyrrolizine-acetic-acid ethylesters. Following column chromatography (silica gel, n-hexane/ether 1+1 in Example 117 or Al.sub.2 O.sub.3, n-hexane-ether 9+1 in the remaining compounds), the products are obtained in the form of oils.

The compounds so obtained and the infra-red data relation to them are shown in Table 16.

TABLE 15______________________________________ ##STR24##EXAMPLE MELTING PT.Nr. R .degree.C. IR (CC)______________________________________108 CH.sub.3 84b 149 1605109 C.sub.2 H.sub.5 84c 68-69 1605110 n-C.sub.3 H.sub.7 84d -- 1605111 n-C.sub.4 H.sub.9 84e -- 1605112 n-C.sub.5 H.sub.11 84f 1605113 n-C.sub.6 H.sub.13 84g 1605114 n-C.sub.8 H.sub.17.sup.1) 84h115 iso-C.sub.4 H.sub.9 84i 107 1600116 Neopentyl 84j 89 1605______________________________________ .sup.1) mixture with nC.sub.8 H.sub.17 Br, reacted without further purification TABLE 16______________________________________ ##STR25##EXAMPLENr. R IR (CO)______________________________________117 H 85a 1730118 CH.sub.3 85b 1740119 C.sub.2 H.sub.5 85c 1735120 n-C.sub.3 H.sub.7 85d 1740121 n-C.sub.4 H.sub.9 85e 1735122 n-C.sub.5 H.sub.11 85f 1740123 n-C.sub.6 H.sub.13 85g 1740124 n-C.sub.8 H.sub.17 85h 1740125 iso-C.sub.4 H.sub.9 85i 1735126 Neopentyl 85j 1735______________________________________

GENERAL PROCEDURE FOR SAPONIFYING THE (2-METHYL-4,5-DIPHENYLPYRROLE-3-YL)-ACETIC-ACID ETHYLESTERS

The solution of 0.6 mmoles of (2-methyl-4,5-diphenylpyrrole-3-yl)-acetic-acid ethylester or of (1-alkyl-2-methyl-4,5-diphenylpyrrole-3-yl)-acetic-acid ethylester in 5 ml of ethanol is heated to boiling. Then 3 ml of 10% aqueous KOH previously degassed by boiling are dripped into the batch which is further heated for 1 h with reflux. Following cooling the batch is poured into 100 ml of 5% NaCl solution and the mixture is then acidified with 8% H.sub.3 PO.sub.4 and extracted three times with ether. The organic phases are dried by means of Na.sub.2 SO.sub.4 and concentrated. Production purification takes place by column chromatography (silica gel, 1st n-hexane/ether 1+1 in The Examples 127-131, or 2+1 in Examples 132-136, 2nd ether). The eluates are concentrated down to a few ml. After adding n-hexane and concentrating again, the product precipitates.

The compounds so obtained and their physical data are shown in Table 17.

TABLE 17______________________________________ ##STR26##EXAMPLE MELTINGNr. R POINT .degree.C. IR (CO)______________________________________127 H 86a 110 1710128 CH.sub.3 86b 161 1710129 C.sub.2 H.sub.5 86c 177 1705130 n-C.sub.3 H.sub.7 86d 172 1700131 n-C.sub.4 H.sub.9 86e 129 1705132 n-C.sub.5 H.sub.11 86f 121 1710133 n-C.sub.6 H.sub.13 86g 127 1710134 n-C.sub.8 H.sub.17 86h 45 1715135 iso-C.sub.4 H.sub.9 86i 168 1710136 Neopentyl 86j 163 1710______________________________________

GENERAL PROCEDURE FOR PREPARING THE 6-ARYL-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINES OR THE 6-PHENYL -7-ARYL-2,3-DIHYDRO-1H-PYRROLIZINES

20 mmoles of aromatics-substituted* or unsubstituted .alpha.-bromo-acetophe-none dissolved in 25 ml of CH.sub.2 Cl.sub.2 are mixed with the solution of 20 mmoles of unsubstituted or aromatics-substituted** resp. 2-benzyl-.DELTA.1-pyrroline in 50 ml of ethanol and are stirred for 24 h at room temperature. Then 20 ml of saturated aqueous NaHCO.sub.3 solution are added and the batch is stirred for another 24 h at room temperature. The batch is poured into 500 ml of 5% NaCl solution and is extracted three times each time with 100 ml of ether/CH.sub.2 Cl.sub.2 3+1. The organic phases are dried by means of Na.sub.2 SO.sub.4 and processed in the manner discussed below.

*.alpha.-bromo-3-chloroacetophenone, .alpha.-bromo-3,4-dimethoxyacetophenone, .alpha.-bromo-3,4-dichloroacetophenone and .alpha.-bromo-4-phenoxyacetophenone are not available commercially. They are prepared as follows:

A solution of 20 mmoles (3.2 g) of bromine in 10 ml of CH.sub.2 Cl.sub.2 is slowly dripped into the solution of 20 mmoles of 3-chloroacetophenone, 3,4-dimethoxyacetophenone, 3,4-dichloroacetophenone or 4-phenoxyacetophenone in 15 ml of CH.sub.2 Cl.sub.2 and 20 ml of dioxan. Thereupon the batch is mixed with 50 ml of CH.sub.2 Cl.sub.2 and carefully washed twice with 5% NaHCO.sub.3 solution to remove the Hbr. The organic phase is dried by means of Na.sub.2 SO.sub.4 and concentrated. The residue is reacted directly as described above with 20 mmoles of 2-benzyl-.DELTA.1-pyrroline.

**2-(4-chlorobenzyl)-.DELTA.1-pyrroline:

The preparation is similar to that for 2-benzyl-.DELTA.1-pyrroline (J. AMER. CHEM. SOC. 1932, 54, pp 3971-3976)

**2-(4-methylbenzyl)-.DELTA.1-pyrroline:

A Grignard reagent is prepared from 0.15 moles (3.6 g) of Mg and 0.15 moles (21.1 g) of methylbenzyl chloride in 150 ml of absolute ether. After dripping 0.15 moles (15.5 g) of 4-chlorobutyronitrile dissolved in 100 ml absolute ether into the batch, same is heated for 2 h to reflux. Next the ether is distilled and 200 ml of absolute xylene are added. After further boiling with reflux for 2 h, the batch is mixed with 100 ml of H.sub.2 O while being ice-cooled and is acidified with dilute H.sub.3 PO.sub.4. The aqueous phase is made alkaline with concentrated NH.sub.3 and ice-cooling and the generated precipitate is evacuated. The filtrate is extracted three times with 50 ml of CH.sub.2 Cl.sub.2 and the precipitate is washed with 100 of CH.sub.2 Cl.sub.2. The CH.sub.3 Cl.sub.2 solutions are combined, dried by means of Na.sub.2 SO.sub.4 and concentrated. The product is isolated from the last residue by distillation (boiling point 117.degree. C. at 0.1 torr). Yield 3.7 g (14%). C.sub.12 H.sub.15 N (173.3). Ir:.nu..sub.max =1640 (C.dbd.N), 1605 (C.dbd.C)/cm.

**2-(4-methoxybenzyl)-.DELTA.1-pyrrolline:

4-methoxybenzyl magnesium chloride is prepared from 3.0 moles (72.9 g) of Mg and 0.15 moles (23.5 g) of 4-methoxybenzylchloride in 500 ml of absolute ether. The product is reacted further with 0.15 moles (15.5 g) of 4-chlorobutyronitrile and is purified by distillation (boiling point 142 C. at 0.1 torr). Yield 2.4 g (8%). C.sub.12 H.sub.15 NO (189.3). Ir: .nu..sub.max =1640 (C.dbd.N), 1610 (C.dbd.C)/cm.

GENERAL PROCEDURE FOR PREPARING 3-(6-CHLOROPHENYL-AND 6-NITROPHENYL-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL)-PROPIONIC-ACID METHYLESTERS

4 mmoles of 6 chloro- or 6-nitrophenyl-7-phenyl-2,3-dihydro-1H-pyrrolizine and 6 mmoles (0.52 g) of acrylic-acid methylester are dissolved in 16 ml of absolute dichloroethane. After adding 0.24 ml of BF.sub.3 ethylene complex, the batch is stirred for 1 h at room temperature, and the same amounts of acrylic-acid methylester and BF.sub.3 ethylether complex are added in each case again after 15 minutes. Thereupon the batch is poured into 100 ml of 10% NaCl solution and is extracted twice with ether/CH.sub.2 Cl.sub.2 3+1. The organic phases are dried by means of Na.sub.2 SO.sub.4 and concentrated. The residue then is processed in the manner discussed below.

GENERAL PROCEDURE FOR SAPONIFYING THE 3-(6-CHLOROPHENYL-AND 6-NITROPHENYL-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-6-YL)-PROPIONIC-ACID METHYLESTERS

The solution of 1 mmole of the corresponding pyrrolizinyl-propionic-acid methylester in 10 ml of ethanol is heated to boiling. 5 ml of 10% aqueous KOH solution previous degassed is dripped into the batch which is then heated another 5 minutes with reflux. Following cooling the batch is poured into 100 ml of 5% NaCl solution and acidified with 8% H.sub.3 PO.sub.4 and extracted three times with ether/CH.sub.2 Cl.sub.2 3+1. The organic phases are dried by means of Na.sub.2 SO.sub.4, concentrated, and processed in the manner described above.

GENERAL PROCEDURE FOR THE VILSMEIER FORMYLATION OF AROMATICS-SUBSTITUTED 6,7-DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINES

6 mmoles of the corresponding pyrrolizine dissolved in 6 ml of absolute benzene are reacted with 18 mmoles (1.32 g) of absolute DMF and 6 mmoles (0.92 g) of POCl.sub.3 similarly to the procedure for the Vilsmeier formylation of the diphenyl-2,3-dihydro-1H-pyrrolizines.

GENERAL PROCEDURE FOR PREPARING AROMATICS-SUBSTITUTED 6,7-DIPHENYL-2,3-DIHYDRO-1H-PYROLLIZINYL-ACRYLIC-ACID ETHYLESTERS

2.5 mmoles of the corresponding carbaldehyde dissolved in 5 ml of absolute CH.sub.2 Cl.sub.2 are reacted with the solution of 2.5 mmoles (1.08 g) of ethoxycarbonyl-methyltriphenyl-phosphonium bromide in 4 ml of absolute ethanol and with a solution of Na-ethanolate prepared from 7.5 mmoles (0.17 g) of sodium and 3 ml of absolute ethanol in a manner similar to the procedure for preparing the diphenyl-2,3-dihydro-1H-pyrrolizinyl-acrylic-acid ethylesters.

GENERAL PROCEDURE FOR SAPONIFYING AROMATICS-SUBSTITUTED 3-(6-7-DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL)-ACRYLIC-ACID ETHYLESTERS.

1.2 mmoles of the corresponding pyrrolizinyl-acrylic-acid ethylesters dissolved in 50 ml of ethanol are reacted with 10 ml of aqueous KOH similarly to the procedure for saponifying the 3-(diphenyl-2,3-dihydro-1H-pyrrolizine-5-yl)-acrylic-acid ethylesters.

GENERAL PROCEDURE FOR HYDROGENATING AROMATICS-SUBSTITUTED 3-(6,7-DIPHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL) ACRYLIC ACIDS

0.9 mmoles of the corresponding pyrrolizinyl acrylic acid are dissolved in 30 ml of absolute THF. After adding 10 ml of absolute ethanol and a spatula tip-ful of PtO.sub.2 (alternatively, palladium also may be used), hydrogenation is carried out in the autoclave for about 4 h at 15 bars. Several times a spatula tip-ful of fresh PtO.sub.2 (or palladium) is added. Upon complete reaction (thin-layer chromatography: silica gel, THF), the catalyst is evacuated, the solvent is distilled and the product is isolated.

GENERAL PROCEDURE FOR SPLITTING THE ARYLMETHYLETHERS

0.5 mmoles of the corresponding methyl compound dissolved in 5 ml of absolute CH.sub.2 Cl.sub.2 are dripped into the solution of 0.20 ml of BBr.sub.3 in 3 ml of absolute CH.sub.2 Cl.sub.2 at -80.degree. C. The mixture is allowed to rise to room temperature in about 8 h. After adding 30 ml of H.sub.2 O, extraction is carried out three times with ether. The organic phases are washed twice with a saturated NaCl solution, dried by means of Na.sub.2 SO.sub.4 and are processed.

The compounds so obtained and their physical properties are shown in the Tables 18 through 27 below.

TABLE 18______________________________________ ##STR27##EXAMPLE MELT. PT.Nr. R.sub.meta R.sub.para R'.sub.para .degree.C. IR (CC)______________________________________138 Cl H H 1600.sup. 139.sup.1) H Cl H140 NO.sub.2 H H 117 1605141 H NO.sub.2 H 132 1595142 H H CI 156 1605______________________________________ .sup.1) Chemiker-Zeitung 1986, 110, 267-271 TABLE 19______________________________________ ##STR28##EXAMPLE MELTING PT.Nr. R.sub.meta R.sub.para R'.sub.para .degree.C. IR (CO)______________________________________143 Cl H H 99 1735144 H Cl H 98 1730145 NO.sub.2 H H 1740146 H NO.sub.2 H 1740147 H H Cl 111 1730______________________________________ TABLE 20______________________________________ ##STR29##EXAMPLE MELT. PT.Nr. R.sub.meta R.sub.para R'.sub.para .degree.C. IR (CO)______________________________________143 Cl H H 99 1735144 H Cl H 98 1730145 NO.sub.2 H H 1740146 H NO.sub.2 H 1740147 H H Cl 111 1730______________________________________ TABLE 21______________________________________ ##STR30##EXAMPLE MELT. PT. IRNr. R .degree.C. (CO)______________________________________153 H 1605 (CC)154 CHO >84 1650155 CHCHCOOC.sub.2 H.sub.5 (E) 122 1715156 CHCHCOOH (E) 229 1660157 (CH.sub.2).sub.2 COOH 157 1710______________________________________ TABLE 22______________________________________ ##STR31## MELT.EXAMPLE PT.Nr. R.sub.meta R.sub.para R'.sub.para .degree.C. OR (CC)______________________________________158 CH.sub.3 H H 1605159 H CH.sub.3 H 1605160 OCH.sub.3 H H 1605.sup. 161.sup.1) H OCH.sub.3 H.sup. 162.sup.1) OCH.sub.3 OCH.sub.3 H.sup. 163.sup.2) H OC.sub.6 H.sub.5 H164 Cl Cl H 119 1605165 H H CH.sub.3 104 1610166 H H OCH.sub.3 1605______________________________________ .sup.1) Chemiker-Zeitung 1986 110, 267-271 .sup.2) the product is impure; it is made to react without further purification TABLE 23______________________________________ ##STR32## MELT.EXAMPLE PT.Nr. R.sub.meta R.sub.para R'.sub.para .degree.C. IR (CO______________________________________167 CH.sub.3 H H 128 1645168 H CH.sub.3 H 142 1645169 OCH.sub.3 H H 117 1635.sup. 170.sup.1) H OCH.sub.3 H.sup. 171.sup.1) OCH.sub.3 OCH.sub.3 H172 H OC.sub.6 H.sub.5 H 135 1635173 Cl Cl H 162 1640174 H H CH.sub.3 102 1645______________________________________ .sup.1) Chemiker-Zeitung 1986 110, 267-271 TABLE 24______________________________________ ##STR33## MELT.EXAMPLE PT.Nr. R.sub.meta R.sub.para R'.sub.para .degree.C. IR (CO)______________________________________175 CH.sub.3 H H 142 1710176 H CH.sub.3 H 158 1710177 OCH.sub.3 H H 119 1710178 H OCH.sub.3 H 164 1705179 OCH.sub.3 OCH.sub.3 H 133 1705180 H OC.sub.6 H.sub.5 H 173 1705181 Cl Cl H 122 1715182 H H CH.sub.3 222 1705______________________________________ TABLE 25______________________________________ ##STR34## MELTINGEXAMPLE PT.Nr. R.sub.meta R.sub.para R'.sub.para .degree.C. IR (CO)______________________________________183 CH.sub.3 H H 216 1660184 H CH.sub.3 H 221 1680185 OCH.sub.3 H H 205 1670186 H OCH.sub.3 H 216 1675187 OCH.sub.3 OCH.sub.3 H 216 1660188 H OC.sub.6 H.sub.5 H 221 1660189 Cl Cl H 229 1660190 H H CH.sub.3 118 1665______________________________________ TABLE 26______________________________________ ##STR35## MELT.EXAMPLE PT.Nr. R.sub.meta R.sub.para R'.sub.para .degree.C. IR (CO)______________________________________191 CH.sub.3 H H 125 1710192 H CH.sub.3 H 122 1710193 OCH.sub.3 H H 111 1710194 H OCH.sub.3 H 73 1710195 OCH.sub.3 OCH.sub.3 H 152 1725196 OH H H 87 1710197 H OH H 187 1700198 OH OH H 76 1710199 H OC.sub.6 H.sub.5 H 178 1705200 Cl Cl H 144 1710201 H H CH.sub.3 182 1705______________________________________ TABLE 27______________________________________ ##STR36## MELT.EXAMPLE PT.Nr. R R.sub.para .degree.C. IR (CO)______________________________________202 H Cl 118 1605 (CC)203 (CH.sub.2).sub.2 COOCH Cl 113 1735204 (CH.sub.2).sub.2 COOH.sub.3 Cl 207 1710______________________________________

EXAMPLE 205

2,2-DIMETHYL-6-(4-FLUORO)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE(1v)

20 mmoles of .alpha.-chlorine-4-fluoroacetophenone dissolved in 25 ml of CH.sub.2 Cl.sub.2 are mixed with the solution of 20 mmoles of 2-benzyl-4,4-dimethyl-.DELTA.1-pyrroline 25 ml of ethanol and the batch is stirred for 24 h at a bath temperature of 70.degree. C. Thereupon 20 ml of saturated aqueous NAHCO.sub.3 solution is added and agitation continues for another 24 h at the same temperature. The batch is poured into 500 ml of 5% NaCl solution and is then extracted three times each time with 100 ml of ether/CH.sub.2 Cl.sub.2 3+1. The organic phases are dried by means of Na.sub.2 SO.sub.4. The product is precipitated by column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 9+1) in the form of an oil

Yield 3.1 g (51%).

C.sub.21 H.sub.20 FN (305.4).

IR: .nu..sub.max =1605 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.28 (s, 6H, --CH.sub.3), 2.78 (s, 2H, C-1), 3.71 (s, 2H, C-3), 6.64 (s, 1H, C-5), 6.75-7.60 (m, 9H, Arom.).

EXAMPLE 206

2,2-DIMETHYL-6-(4-FLUORO)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLOZINE-5-YL-CARBALDEHYDE (6v)

19 mmoles of iv dissolved in 9 ml of absolute benzene are reacted with 27 mmoles (1.97 g) of absolute DMF and 9 mmoles (1.38 g) of POCl.sub.3 in a manner similar to the Vilsmeier formylation of the diphenyl-2,3-dihydro-1H-pyrrolines. Purification is by means of column chromatography (silica gel, n-hexane/ether 2+1). When the eluates are concentrated, the product precipitates.

Yield: 0.9 g (30%)

Melting point: 186.degree. C.

C.sub.22 H.sub.20 FNO (333.4).

IR: .nu..sub.max =1645 (C.dbd.O), 1610 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.33 (s, 6H, --CH.sub.3), 2.83 (s, 2H, C-1), 4.18 (s, 2H, C-3), 6.90-7.44 (m, 9H, Arom.), 9.38 (s, 1H, --CHO).

EXAMPLE 207

3-(2,2-DIMETHYL-6-(4-FLUORO-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL)-ACRYLIC-ACID ETHYLESTERS (34v)

2 mmoles of 6v dissolved in 15 ml of absolute CH.sub.2 Cl.sub.2 are reacted with the solution of 2 mmoles (0.86 g) of ethoxycarbonyl methyltriphenylphosphonium bromide in 4 ml of absolute ethanol and a solution of Na-ethanolate prepared from 6 mmoles (0.14 g) sodium and 3 ml absolute ethanol in a manner similar to the procedure for preparing the diphenyl-2,3-dihydro-1H-pyrrolizinyl acrylic-acid ethylester. Purification is by column chromatography (silica gel, CH.sub.2 Cl.sub.2). After the eluates have been concentrated, the product remains in the form of a foam.

Yield: 0.33 g (41%).

Melting point: 152.degree. C.

C.sub.26 H.sub.26 FNO.sub.2 (403.5).

IR: .nu..sub.max =1715 (C.dbd.O), 1620 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.27 (t, 3H, J=7 Hz, --O--CH.sub.2 --CH.sub.3), 1.33 (s, 6H, --CH.sub.3), 2.86 (s, 2H, C-1), 4.00 (s, 2H, C-3), 4.19 (q, 2H, J=7 Hz, --O--CH.sub.2 --CH.sub.3), 5.90 (AB, 1H, J=16.4 Hz, .dbd.CH--CO--), 6.87-7.34 (m, 9H, Arom.), 7.48 (AB, 1H, J=16.4 Hz, Pyr--CH.dbd.).

EXAMPLE 208

3-(2,2-DIMETHYL-6(4-FLUORO)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL) ACRYLIC-ACID (35v)

0.6 mmoles of 34v dissolved in 30 ml of ethanol are reacted with 6 ml of 10% aqueous KOH in a manner similar to the saponification of the diphenyl-2,3-dihydro-1H-pyrrolizinyl acrylic-acid esters.

Yield 0.20 g(89%.

Melting point: 242.degree. C.

IR: .nu..sub.max =3300-2200 (OH), 1685, 1670 (C.dbd.O), 1600 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR (d.sub.6 -DMSO): .delta.(ppm)=1.27 (s, 6H, --CH.sub.3), 2.84 (s, 2H, C-1), 4.06 (s, 2H, C-3), 5.92 (AB, 1H, J=16.4 Hz, .dbd.CH--CO--), 6.87-7.41 (m, 9H, Arom. and Pyr--CH.dbd.).

EXAMPLE 209

3-(2,2-DIMETHYL-6-(FLUORO)-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL)-PROPIONIC ACID (27v)

0.3 mmoles of 27v are reacted int he manner of the procedure for hydrogenating the aromatics-substituted 3-(6,7-diphenyl-2,3-dihydro-1H-pyrrolizine-5-yl)-acrylic-acids. Palladium is used as the catalyst. The product is precipitated by means of hexane.

Yield: 0.08 g (71%).

Melting point: 182.degree. C.

C.sub.24 H.sub.24 FNO.sub.2 (377.5): COMPUTED: C 76.4; H 6.41; N 3.7. MEASURED: C 75.8; H 6.56; N 3.3.

IR: .nu..sub.max =3300-2400 (OH), 1710 (C.dbd.O), 1605 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.30 (s, 6H, --CH.sub.3), 2.28-2.58 (m, 2H, --CH.sub.2 --CO--), 2.73-3.03 (m, 2H, Pyr--CH.sub.2 --), 2.81 (s, 2H, C-1), 3.68 (s, 2H, C-3), 6.76-7.28 (m, 9H, Arom.).

EXAMPLE 210

2,2-DIMETHYL-6-(4-PHENOXYPHENOL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE (1w)

20 mmoles of 2 benzyl-4,4-dimethyl-.delta.1-[pyrroline 1b.sub.3 are reacted with 20 mmoles of .alpha.-bromo-4-chloroacetophenone in 50 ml of ethanol similarly to the procedure for preparing the 6-aryl-7-phenyl-2,3-dihydro-1H-pyrrolizines. Purification is by column chromatography (Al.sub.2 O.sub.3, n-hexane/ether 9+1). Following concentration of the eluates, 1w remains in the form of oil

Yield: 2.7 g(36%).

C.sub.27 H.sub.25 NO (379.5).

IR: .nu..sub.max =1605 und 1595 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.28 (s, 6H, --CH.sub.3), 2.78 (s, 2H, C-1), 3.71 (s, 2H, C-3), 6.65 (s, 1H, C-5), 6.78-7.57 (m, 14H, Arom.).

EXAMPLE 211

2,2-DIMETHYL-6-(4-PHENOXYPHENYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL-CARBALDEHYDE (6w)

5 mmoles of 1w dissolved in 6 ml of absolute benzene are reacted with 18 mmoles (1.32 g) of absolute DMF and 6 mmoles (0.92 g) of POCl.sub.3 similarly to the procedure for the Vilsmeier formylation of the diphenyl-2,3-dihydro-1H-pyrrolizines. Purification is by column chromatography (silica gel, CH.sub.2 Cl.sub.2). The product is precipitated by ethanol.

Yield: 0.94 g (38%).

Melting point: 139.degree. C.

C.sub.28 H.sub.25 NO.sub.2 (407.5).

IR: .nu..sub.max =1645 (C.dbd.O), 1605 und 1590 (C.dbd.C)cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.30 (s, 6H, --CH.sub.3), 2.81 (s, 2H, C-1), 4.17 (s, 2H, C-3), 6.84-7.47 (m, 14H, Arom.), 9.40 (s, 1H, --CHO).

EXAMPLE 212

3-(2,2-DIMETHYL-6-(4-PHENOXYPHENYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL)-ACRYLIC-ACID ETHYLESTERS (34w)

2 mmoles of 6w dissolved in 5 ml of absolute CH.sub.3 Cl.sub.2 are reacted with the solution of 2 mmoles (0.86 g) of ethoxycarbonyltrimethyltriphenylphosphonium bromide in 4 ml of absolute ethanol and a solution of Na-ethanolate prepared from 6 mmoles (0.14 g) of sodium and 3 ml of absolute ethanol in a manner similar to the procedure for preparing the diphenyl-2,3-dihydro-1H-pyrrolizinyl acrylic-acid esters. Purification is by column chromatography (silica gel, CH.sub.2 Cl.sub.2). The product remains in the form of foam after the eluates have been concentrated.

Yield: 0.33 g (35%).

Melting point: from 69.degree. C.

C.sub.32 H.sub.31 NO.sub.3 (477.6).

IR; .nu..sub.max =1705 (C.dbd.O), 1610 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.28 (t, 3H, J=7 Hz, --O--CH.sub.2 --CH.sub.3), 1.33 (s, 6H, --CH.sub.3), 2.86 (s, 2H, C-1), 4.00 (s, 2H, C-3), 4.19 (q, 2H, J=7 Hz, --O--CH.sub.2 --CH.sub.3), 5.92 (AB, 1H, J=16 Hz, .dbd.CH--CO--), 6.83-7.44 (m, 14H, Arom.), 7.56 (AB, 1H, J=16 Hz, Pyr--CH.dbd.).

EXAMPLE 213

3-(2,2-DIMETHYL-6-(4-PHENOXYPHENYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL) ACRYLIC ACID 935w)

0.6 mmoles of 34w dissolved in 30 ml of ethanol are reacted with 6 ml of 10% aqueous KOH n a manner similar to the procedure for saponifying the diphenyl-2,3-dihydro-1H-pyrrolizine-5-yl acrylic-acid ethylesters.

Yield: 0.23 g (85%).

Melting point: 198.degree. C.

C.sub.30 h.sub.27 NO.sub.3 (449.5) COMPUTED C 80.2; H 6.05; N 3.1. MEASURED C 79.9; H 6.07; N 2.7.

IR: .nu..sub.max =3300-2200 (OH), 1675 (C.dbd.O), 1590 (C.dbd.C) cm.sup.-1.

.sup.1 H-NMR (d.sub.6 -DMSO): .delta.(ppm)=1.27 (s, 6H, --CH.sub.3), 2.83 (s, 2H, C-1), 4.06 (s, 2H, C-3), 5.92 (AB, 1H, J=16.2 Hz, .dbd.CH--CO--), 6.86-7.57 (m, 15H, Arom. and Pyr--CH.dbd.).

EXAMPLE 214

3-(2,2-DIMETHYL-6-(4-PHENOXYPHENYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL) PROPIONIC ACID (27w)

0.3 mmoles of 35w are reacted in the manner of the procedure for hydrogenating the aromatics-substituted 3-(6,7-diphenyl-2,3-dihydro-1H-pyrrolizine-5-yl) acrylic acids. Palladium is used as the catalyst. The product is precipitated by n-hexane.

Yield: 0.10 g (74%).

Melting point: 149.degree. C.

C.sub.30 H.sub.29 NO.sub.3 (451.6; COMPUTED; C 79.8; H 6.47; N 3.1. MEASURED; C 79.5; H 6.61; N 2.7.

IR: .nu..sub.max =3300-2400 (OH), 1710 (C.dbd.O), 1605 and 1595 (C.dbd.C)cm.sup.-1.

.sup.1 H-NMR: .delta.(ppm)=1.29 (s, 6H, --CH.sub.3), 2.34-2.63 (m, 2H, --CH.sub.2 --CO--), 2.77-3.06 (m, 2H, Pyr--CH.sub.2 --), 2.83 (s, 2H, C-1), 3.69 (s, 2H, C-3), 6.85-7.47 (m, 14H, Arom.).

EXAMPLE 215

2-(2,2-DIMETHYL-6-(4-PHENOXYPHENYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL) PROPIONIC-ACID ETHYLESTERS (54a)

2.5 mmoles of 6-(4-phenoxyphenyl)-7-phenyl-2,3-dihydro-1H-pyrrolizine 1w dissolved in 3 ml of absolute toluene are reacted with 4 mmoles (0.51 g) of 2-diazopropionic-acid ethylester dissolved in 3 ml of absolute toluene in a manner similar to the procedure for preparing the diphenyl-2,3-dihydro-1H-pyrrolizinyl acetic-acid ethylesters["s.S."201]. Isolation is by means of column chromatography (Al.sub.2 O.sub.3, n-hexane-/ether 9+1). The oily product (0.45 g) remaining after concentration of the eluates is impure. It is reacted further without additional purification.

EXAMPLE 216

2-(2,2-DIMETHYL-6-(4-PHENOXYPHENYL)-7-PHENYL-2,3-DIHYDRO-1H-PYRROLIZINE-5-YL) PROPIONIC ACID (56a)

The impure 54a (0.45 g) dissolved in 10 ml of ethanol is reacted with 5 ml of 10% aqueous KOH in a manner similar to the saponification procedure for the diphenyl-2,3-dihydro-1H-pyrrolizinyl acetic-acid ethylesters. The time of saponification is 90 minutes. Purification is by column chromatography (silica gel, diisopropylether).

Yield: 90 mg.

Melting point: 186.degree. C.

C.sub.30 H.sub.29 NO.sub.3 (451.6).

IR: .nu..sub.max =3300-2400 (OH), 1710 (C.dbd.O), 1605 and 1595 (C.dbd.C) cm.sup.-1.

1H-NMR: .delta.(ppm)=1.23 (s, 3H--CH.sub.3), 1.32 (s, 3H, --CH.sub.3), 1.48 (d, 3H, J=7 Hz, CH.sub.3 --CH<), 2.72, 2.91 (AB, 2H, J=15.5 Hz, C-1), 3.81 (s, 2H, C-3), 3.96 (z, 1H, J=7 Hz, --CH<), 6.81-7.50 (m, 10H, Arom.).

Claims

1. A substituted pyrrolizine compound of the formula (I): ##STR37## as well as the pharmaceutically compatible salts or esters thereof; wherein two of the residues R.sup.3 and R.sup.4 and R.sup.5 independently from one another represent a phenyl or naphthyl group wherein at least one of said phenyl or naphthyl groups is substituted by one or two residues selected from a halogen atoms, a nitro-, a C.sub.1 -C.sub.4 alkoxy-, a hydroxy, a C.sub.1 -C.sub.4 alkyl- or phenoxy-group and wherein the third of the residues R.sup.3, R.sup.4 and R.sup.5 denotes CO.sub.2 H, --COSC.sub.1 -C.sub.4 --alkyl or A-X, with A being a straight chain or a branched C.sub.1 -C.sub.8 -alkylene group which may be interrupted by an oxygen heteroatom or a carbonyl group or said A being a C.sub.2 -C.sub.8 alkenylene group with the proviso that A is not --CH.sub.2 --when X is OH; and said X being CO.sub.2 H, SO.sub.3 H, CHO, OH or SH; and R6 and R.sup.7 independently form one another represent a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group.

2. The compound defined in claim 1 wherein two of the residues R.sup.3, R.sup.4 and R.sup.5 represent a phenyl group, and at least one of said phenyl groups is substituted by one or two residues selected from a halogen atom, a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy-,hydroxy-, phenoxy and nitro group and the third residue represent A-X, whereby A denotes a C.sub.1 -C.sub.8 alkylene group or a C.sub.2 -C.sub.8 alkenylene group and X represent CO.sub.2 H.

3. The compound of claim 2 wherein he halogen is fluorine or chlorine.

4. The compound defined in claim 1 having the formula: ##STR38## wherein R.sup.6 and R.sup.7 denote a hydrogen atom or a C.sub.1 -C.sub.4 -alkyl group, R.sup.3 and R.sup.4 independently from one another represent a phenyl group which may be substituted by a halogen atom, A represents a C.sub.1 -C.sub.8 -alkyl group and X represents CO.sub.2 H.

5. The compound defined in claim 4 where R.sup.3 and R.sup.4 independently from one another represent a phenyl group or a p-chlorophenyl group and where AX represents CH.sub.2 CO.sub.2 H.

6. The compound defined in claim 5 where R.sup.6 and R.sup.7 represent a C.sub.1 -C.sub.4 -alkyl group.

7. The compound of claim 6 wherein R.sup.6 and R.sup.7 are a methyl group.

8. A pharmaceutical composition containing at least one compound defined in claim 1 together with an effective amount of conventional pharmaceutically-compatible inactive substances and/or additives.