Process for preparing 4-substituted imidazo[1,2-a]quinoxalines

This invention relates to certain 4-substituted imidazo[1,2-a]quinoxalines and to processes for preparing the same. It also concerns certain 1-(2-acylaminophenyl)imidazoles which among other things are useful as intermediates in the preparation of 4-substituted imidazo[1,2-a]quinoxalines. The aforesaid compounds are useful for a variety of purposes which will be described in more detail below. Some of these are useful as immunosuppressants; whereas, others are useful as anti-inflammatory agents or display antifungal activity. Moreover, some exhibit two or all three of these activities.
The 4-substituted imidazo[1,2-a]quinoxalines encompassed in the present invention may be described by the formula: ##STR2## and pharmaceutically acceptable salts thereof wherein X is --R.sup.1 and --NHR.sup.2 wherein:
(1) R.sup.1 is bonded to a ring carbon by a carbon-to-carbon linkage and is an aliphatic, cycloaliphatic, substituted phenyl, fused bicyclic aryl; or monocyclic aryl-substituted aliphatic; and
(2) R.sup.2 is a radical bonded to a nitrogen by a carbon to nitrogen linkage; said radical being selected from the group consisting of aliphatic, cycloaliphatic, phenyl, substituted phenyl, fused bicyclic aryl or a monocyclic aryl-substituted aliphatic group.
When R.sup.1 is an aliphatic group, it may be a straight chain or branched chain hydrocarbon group which is saturated, monounsaturated or polyunsaturated. It may also comprise a straight chain or branched chain group containing other than carbon-to-carbon bondings e.g. ether linkages, carbon to halogen linkages, etc. Ordinarily, it will contain from about 1 to 18 carbon atoms, the most typical radicals of this group being the alkyl radicals having from 1 to 18 carbon atoms.
By way of illustrating the aliphatic groups that may be represented by R.sup.1, the following are given: CH.sub.3 --; CH.sub.3 CH.sub.2 --; CH.sub.3 CH.sub.2 --CH.sub.2 --; CH.sub.3 (CH.sub.2).sub.n -- in which n is 3, 4, 5, 6, 7, 8, 14 and 16 respectively; (CH.sub.3).sub.2 CH--CH.sub.2 --; CH.sub.3 (CH.sub.2).sub.3 (CH.sub.3 CH.sub.2)CH--, CH.sub.2 .dbd.CH--(CH.sub.2).sub.8 --, alkoxyalkyl in which the alkyl moieties have from 1 to 4 carbon atoms e.g. methoxymethyl; halogenoalkyl (i.e. CH.sub.2 Cl--; CH.sub.3 CHCl--; CHCl.sub.2 --; CCl.sub.3 --; CH.sub.2 Br--; CF.sub.3).
When R.sup.1 is a cycloaliphatic radical it will most often be a cycloalkyl radical containing 3 to 8 carbon atoms or a cycloalkenyl radical containing 5 to 6 carbon atoms. By way of illustrating the cycloaliphatic radicals that may correspond to R.sup.1 in formula I mention may be made of the ##STR3##
When R.sup.1 is a substituted phenyl radical in formula I above, the phenyl group may have from 1 to 5 substituents but will usually be mono, di or trisubstituted. Typical among the groups that may be contained in the phenyl group are (a) alkyl groups which are branched or straight chain containing 1 to 6 carbon atoms e.g. methyl, ethyl, tertiary butyl; (b) alkoxyl groups containing 1 to 6 carbon atoms e.g. methoxy, ethoxy; (c) hydroxy; (d) acyloxy containing 1 to 18 carbon atoms; (e) halogen e.g. 1 or 2 Cl, F, Br, I preferably in the meta and/or para position; (f) nitro; (g) amino; (h) acylamino in which the acylamino moiety is derived from an alkanoic acid containing 1 to 18 carbon atoms and benzamides in which the benzene ring is unsubstituted or monosubstituted, disubstituted or trisubstituted with alkyl groups containing 1 to 5 carbon atoms or halogen atoms; (i) polyhydroxyalkylamino groups containing 4 to 8 carbon atoms; (j) cyano; (k) trifluoromethyl; (l) mercapto; (m) alkylthio; (n) acylthio containing 1 to 18 carbon atoms; (o) carboxyl; (p) carboalkoxyl containing 1 to 8 aliphatic carbon atoms; (q) phenyl; (r) phenoxy, and combinations thereof.
When R.sup.1 is a fused bicyclic aryl radical, it may be a substituted or unsubstituted radical. These are exemplified by such fused bicyclic hydrocarbon radicals as 1-napthyl, 2-napthyl, etc.
When R.sup.1 is a monocyclic aryl substituted aliphatic radical, the monocyclic aryl moiety may be either of the substituted or unsubstituted variety. The aliphatic moiety of this group may be either of the saturated or unsaturated straight chain or branched chain hydrocarbon variety or it may contain other than carbon-to-carbon bonding. This may be illustrated by such groups as phenoxymethyl; benzyl, styryl, ##STR4##
The group R.sup.2 in the radical --NHR.sup.2 of formula I above is exemplified by the same radicals given above in illustrating the radical --R.sup.1. In addition, R.sup.2 may also be phenyl as in the case of the group ##STR5##
In general, the compounds included in formula I above as well as the cases in formula I in which X is hydrogen or phenyl may be prepared by heating the corresponding 1-(2-acylaminophenyl)imidazole at reflux in the presence of cyclizing quantities of a cyclizing agent e.g. polyphosphoric acid or phosphorous oxychloride, etc. for sufficient time to cause significant cyclization of this reactant. More particularly, the 1-(2-acylaminophenyl)imidazole reactants that can be employed in this process may be described by the general formula: ##STR6## in which X.sup.2 is R.sup.5 or --NMR.sup.2 wherein:
R.sup.5 is hydrogen or an aliphatic, cycloaliphatic, phenyl or substituted phenyl, fused bicyclic aryl or monocyclic aryl substituted aliphatic radical and R.sup.2 has the same values assigned to it in connection with formula I above.
The group R.sup.5 in formula II is illustrated by the same groups that illustrate R.sup.1 in formula I. However, in addition, R.sup.5 may also be illustrated by the phenyl radical.
The reaction can be depicted by the following equation: ##STR7##
The process of equation III is preferably carried out in the presence of an excess of an organic amine solvent. A variety of solvents may be used for this purpose among which mention may be made of the following: pyridine, 2,6-dimethylpyridine, N,N-dimethylaniline, trimethylamine, and N-methylmorpholine, etc. However, the preferred organic solvent is pyridine.
The quantity of phosphorous oxychloride that is employed in the reaction can vary somewhat. Generally, however, the phosphorous oxychloride will be employed in the range of from about one-half mole to about 6 moles and preferably one-half mole to two moles per mole of compound II.
The desired product IV may be recovered from the reaction mixture using any of the ordinary techniques well known to those skilled in this art. The time of reaction will vary depending upon, among other things, the particular reactants or molar quantities of reactants employed. In general, the reaction time will be from about 30 to 120 minutes.
The temperature employed in carrying out the reaction will also vary depending upon the particular reactants selected, the solvent and other factors. Ordinarily, the temperature employed will be the reflux temperature of the reaction mixture. This generally will be in the range of from about 95.degree. C. to 195.degree. C.
The method of preparing the 1-(2-acylaminophenyl)imidazoles (compound II) will vary depending on the particular type that is being made. Thus, for example, in preparing compound of the general type: ##STR8## where R.sup.5 is hydrogen, aliphatic, cycloaliphatic, phenyl, substituted phenyl, fused bicyclic aryl or monocyclic aryl substituted aliphatic group, the 1-(2-acylaminophenyl)imidazole is reacted with the appropriate acid halide e.g. the acid chloride. This can be expressed by the following equation: ##STR9## in which R.sup.5 has the value ascribed to it above.
The reaction will usually be carried out employing equimolar amounts of the appropriate acid chloride and in the presence of excess solvent (e.g. pyridine) at reflux.
When the compounds in question are of the phenylureylene type e.g. ##STR10## wherein R.sup.2 is hydrogen, aliphatic, cycloaliphatic, phenyl, substituted phenyl, fused bicyclic aryl or monocyclic aryl substituted aliphatic group, these are prepared by reacting the aminophenylimidazole with the appropriate isocyanate. This can be expressed by the following equation: ##STR11## in which R.sup.2 has the value ascribed to it above. This reaction is preferably carried out in the presence of a solvent and at steam bath temperatures. A typical solvent that can be employed is toluene and the reactants are usually used in about equimolar quantities. The products obtained from reactions VI and VIII may be recovered using standard techniques well known to those skilled in this art.
PRIOR ART
U.S. Pat. No. 3,887,566 discloses imidazo[1,2-a]quinoxaline and 4-phenylimidazo[1,2-a]quinoxaline. However, this reference does not disclose the 4-substituted imidazo[1,2-a]quinoxalines of the present invention nor the process for making these compounds. The activity disclosed in this reference for these compounds is as cardiovascular drugs. There is no disclosure of the fact that these compounds may have immunosuppressant activity, antifungal activity or non-steroidal anti-inflammatory action. It is in fact interesting to note that the unsubstituted imidazo[1,2-a]quinoxaline lacks immunosuppressant activity while the 4-phenylimidazo[1,2-a]quinoxaline has only minor activity which is greatly increased by substitution on the para- and meta- positions on the benzene ring.
Uryukina et al, Khim. Geterotsikl. Soedin., 1972, 1558-60 (See C.A. 78, 58345.sup.t (1973) discloses the unsubstituted and the 7-methyl, methoxy, and bromo substituted imidazo[1,2-a]quinoxalines. No 4-substituted products are disclosed nor is any utility disclosed for these compounds.
Kovalev et al, Farmakol, Toksikol (Moscow), 36 (2), 232-238, 1973 (See C.A. 78 154693.sup.a) also discloses the 7-methoxyimidazo[1,2-a]quinoxaline and suggests the use of this material as an hypotensive agent. This reference likewise does not disclose the 4-substituted imidazo[1,2-a]quinoxalines of the present invention or their utility.
Japanese Pat. Nos. 10677/74 and 10678/74 disclose certain 4-substituted 1,2-dihydroimidazo[1,2-a]quinoxalines and the fact that these materials are useful as anti-inflammatory agents. These references do not show the unhydrogenated compounds of this invention. Moreover, no immunosuppressant activity or antifungal activity is disclosed.
Siminov et al, Khim. Geterotsikl, Soedin, 7, 570 (1971) (See C.A. 76, 25242.sup.n 1972) discloses a process for synthesizing imidazo[1,2-a]quinoxaline involving the reduction of 1-(o-nitrophenyl)-2-formylimidazole. This is obviously not related to the process of the present invention.

The following Examples are given to further illustrate the present invention. It is to be understood, however, that they are not limitative of this invention.
The compounds described in the Tables below were prepared as described. Melting points were obtained by the capillary tube method using a Mel-Temp melting point apparatus and are uncorrected. Ultraviolet spectra were obtained in ethanol solution using a Beckman U.V. Acta III or a Beckman DBG. 1-(2-aminophenyl)imidazole was prepared as reported by A. F. Pozharskii, A. M. Siminov and L. M. Sitkina, Khim. Geterotskl. Soedin. 5, 1916 (1969) [chem. Abstr., 72 11427.sup.a (1970)].
Table I below further illustrates the preparation of the aliphatic, cycloaliphatic and monocyclic aryl substituted aliphatic- amidophenylimidazoles of the present invention. Table II further exemplifies the preparation of the aryl (including the fused ring aryl) amidophenylimidazoles of this invention.
Except as noted in Tables I and II, the amides were prepared by reacting equimolar amounts of the appropriate acid chloride with 1-(2-aminophenyl)imidazole in the presence of excess pyridine on a steam bath for 45 minutes. The reaction mixture was then stirred into ice water and the crude product isolated according to one of the following methods.
Method A
If a solid was obtained, it was directly crystallized from the solvent indicated in Table I.
Method B
If an oil was obtained, it was dissolved in a minimum amount of chloroform and passed through an alumina column with the amount of alumina being approximately twenty times the weight of the crude solid; elution was with chloroform. The chloroform was evaporated from the crude product which was crystallized as indicated in Table I.
Method C
If a solution was obtained in the ice water mixture, the pyridine/water azeotrope was removed until the crude product separated. It was then treated as in Method B above.
TABLE I__________________________________________________________________________ ##STR12##1-(2-alkanamidophenyl)imidazoles Isolation % Crystallization AnalysisNo. R Method Yield Solvent m.p., .degree.C. Calc'd Found__________________________________________________________________________1 H.sup.a C 63.3 Water 200-204 C,64.16 64.26 H, 4.85 4.71 N,22.45 22.302 CH.sub.3 A 56.2 Ethanol 163-166 C,65.66 65.69 H, 5.51 5.52 N,20.88 20.843 CH.sub.3 CH.sub.2.sup.b C 73.9 Water 144-146 C,66.96 67.26 H, 6.09 6.15 N,19.52 19.404 CH.sub.3 (CH.sub.2).sub.2 B 31.1 Toluene 108-110 C,68.10 67.95 H, 6.59 6.52 N,18.33 18.255 CH.sub.3 (CH.sub.2).sub.3 B 49.6 Toluene- 123-125 C,69.11 69.14 hexane H, 7.04 7.00 N,17.27 17.176 CH.sub.3 (CH.sub.2).sub.4 B 49.4 isopropyl ether- 103-105 C,70.01 70.31 trichloroethylene H, 7.44 7.45 N,16.33 16.267 CH.sub.3 (CH.sub.2).sub.5 A 55.3 isopropyl ether 96-98 C,70.82 70.79 H, 7.80 7.74 N,15.48 15.238 CH.sub.3 (CH.sub.2).sub.6 A 55.1 isopropyl ether 101-102 C,71.55 71.67 H, 8.12 8.05 N,14.72 14.659 CH.sub.3 (CH.sub.2).sub.7 A 45.6 isopropyl ether 93-95 C,72.21 72.24 H, 8.42 8.41 N,14.03 13.9210 CH.sub.3 (CH.sub.2).sub.8 A 60.6 isopropyl 79-81 C,72.81 73.38 ether-hexane H, 8.68 8.85 N,13.41 13.0211 CH.sub.3 (CH.sub.2).sub.14 B 58.1 isopropyl ether 94-96 C,75.52 75.12 H, 9.89 9.76 N,10.57 10.3812 CH.sub.3 (CH.sub.2).sub.16 B 80.6 isopropyl ether 98-100 C,76.19 76.57 H,10.18 10.28 N, 9.87 9.7913 (CH.sub.3).sub.3 C.sup.b C 48.8 benzene 102-104 C,69.11 69.15 H, 7.04 7.26 N,17.27 17.1914 (CH.sub.3).sub.2 CHCH.sub.2 C 25.4 benzene 128-130 C,69.40 69.60 H, 6.66 7.00 N,17.34 17.4015 CH.sub.3 (CH.sub.2).sub.3 (CH.sub.3 CH.sub.2)CH B 32.8 benzene 125-127 C,71.55 71.86 H, 8.12 7.84 N,14.72 14.9516 CH.sub.2CH(CH.sub.2).sub.8 A 76.8 isopropyl 92-94 C,73.81 74.26 ether-hexane H, 8.36 8.50 N,12.91 12.3017 CH.sub.3 (CH.sub.2).sub.3 (CH.sub.2CHCH).sub.2 (CH.sub.2).sub.7 C 3.6 C. 73.76 C,76.92 76.73 H, 9.32 9.36 N, 9.97 9.7818 ##STR13## C 41.9 ethanol 145.147 C,73.63 H, 5.45 N,15.15 73.81 5.57 15.4119 ##STR14## C 7.7 diethyl ether 205-207 C,74.73 H, 6.27 N,13.76 74.83 6.32 13.5920 ##STR15## A 43.0 ethanol 161-164 C,74.72 H, 5.23 N,14.52 74.94 5.47 14.5521 CH.sub.3 OCH.sub.2 A 49.8 Toluene 146-147 C,62.33 61.99 H, 5.66 5.74 N,18.17 18.4822 ##STR16## A 77.7 Toluene 136.5- 138.5 C,69.61 H, 5.15 N,14.33 69.82 5.37 14.0423 ##STR17## A 10.1 isopropanol 207-209 C,68.71 H, 5.76 N,18.49 68.67 5.85 18.6724 ##STR18## A 55.6 Toluene 151-153 C,69.69 H, 6.27 N,17.41 69.44 6.21 17.5525 ##STR19## A 67.3 Toluene 142.5- 145 C,71.35 H, 7.11 N,15.60 70.88 6.92 15.5926 ##STR20## A 21.6 ethanol 196-198.5 C,72.16 H, 6.06 N,15.78 71.87 6.33 15.4027 CH.sub.2 Cl B 11.9 water 255(dec.) C,56.06 55.92 H, 4.28 4.26 N,17.83 17.7228 CH.sub.3 CHCl A 27.9 Toluene 143.5- C,57.72 57.54 145.5.degree. H, 4.85 4.92 N,16.83 17.1629 CHCl.sub.2.sup.b A 33.2 benzene 162-165 C,48.91 48.94 H, 3.36 3.24 N,15.56 15.42 Cl,26.25 26.1730 CF.sub.3 A 22.0 ethanol 165-167 C,51.77 51.58 H, 3.16 3.20 N,16.47 16.5332 ##STR21## C 14.1 trichloro- ethylene 128-130 C,60.23 H, 5.05 N,16.21 60.21 5.10 16.16__________________________________________________________________________ Notes: .sup.a Prepared from aceticformic anhydride according to R. J. Jones, J. Am. Chem. Soc., 71,644(1949). After removal by distillation of excess solvent, residue dissolved in water and neutralized with NaOH to provide crude product. .sup.b Prepared via the anhydride. .sup.c Could not be crystallized; purified by chromatography on alumina with ethyl acetate as elutant.
TABLE II__________________________________________________________________________ ##STR22##1-(2-Arylamidophenyl)imidazoles Isolation % Crystallization AnalysisNo. Ar Method Yield Solvent m.p., .degree.C. .lambda.max. Calc'd Found__________________________________________________________________________34 ##STR23## A 44.9 dimethoxyethane 148-150 225(21,720) C,72.99 H, 4.98 N,15.96 73.30 5.08 16.0435 ##STR24## A 58.7 ethanol 190-192.5 262(21,400) C,73.63 H, 5.45 N,15.15 73.10 5.32 15.4636 ##STR25## B 58.3 benzene 147-148.5 231,sh(18,200) C,73.63 H, 5.45 N,15.15 73.63 5.24 15.3637 ##STR26## B 57.4 benzene 143-146.5 236(23,400) C,73.63 H, 5.45 N,15.15 73.28 5.29 15.2738 ##STR27## A 53.0 benzene 151-153 .sup.c C,61.63 H, 3.65 N,12.68 60.97 3.62 12.3439 ##STR28## B 79.3 ethyl acetate 136-138 239(20,400) C,75.21 H, 6.63 N,13.27 75.06 6.45 13.3140 ##STR29## A 45.5 isopropanol 198-200 276(28,100) C,77.86 H, 5.05 N,12.38 77.46 4.76 12.0941 ##STR30## A 73.5 dimethylfoemamide, ethanol 194-196 260(17,810) C,62.33 H, 3.92 N,18.17 62.26 3.69 18.1042 ##STR31## A 74.4 dimethylformamide, water 198-202.5 250(16,500) C,62.33 H, 3.92 N,18.17 62.27 4.00 18.3743 ##STR32## A 87.41 dimethylformamide, water 254-256 .sup.c C,54.40 H, 3.14 N,19.82 54.35 3.31 19.8244 ##STR33## A 60.87 dimethylformamide, water 219-220.5 234(1,500) C,70.82 H, 4.20 N,19.49 70.14 4.45 19.1545 ##STR34## B 56.8 benzene 205-208 229(18,500) C,68.32 H, 4.30 N,14.94 67.86 4.02 15.1746 ##STR35## A .sup. 53.2.sup.a dimethylformamide, water 93-96 260(10,100) C,66.20 H, 4.51 N,14.47 65.96 4.37 14.4047 ##STR36## A .sup.b dimethylformamide 189-190.5 240(22,100) C,56.16 H, 3.53 N,12.28 56.03 3.58 12.5148 ##STR37## A 40.1 dimethylformamide, water 199-201.5 258(20,100) C,56.16 H, 3.54 N,12.28 55.84 3.58 12.48 A#38.78dimethyl formamide, ethanol 210-203 (261(16,700) C,6 4.54 H, 4.06 N,14.11 64.70 4.05 13.9550 ##STR39## B 68.5 ethanol 144-146 .sup.c C,64.54 H, 4.06 N,14.11 64.82 3.92 14.5951 ##STR40## A 59.7 ethanol 167-170 240(26,410) C,64.54 H, 4.06 N,14.11 64.41 3.94 13.9252 ##STR41## A 26.6 dimethylformamide, water 210-212 265(21,000) C,57.85 H, 3.34 N,12.65 58.05 3.46 13.0853 ##STR42## A 61.2 dimethylformamide, water 180.5-183 235(22,100) C,57.85 H, 3.34 N,12.65 57.65 3.51 12.9354 ##STR43## A 42.9 ethanol 186.5-189 255(28,480) C,49.38 H, 3.11 N,10.80 I, 49.22 3.15 10.85 32.8955 ##STR44## B 58.6 isopropanol 146-151 263(20,400) C,69.61 H, 5.15 N,14.33 69.01 5.14 14.3656 ##STR45## B 83.2 dimethylformamide, water 171-173 281(5,100) C,69.61 H, 5.15 N,14.33 69.27 5.02 14.2857 ##STR46## B 61.2 benzene 130-132.5 244,sh(12,300) C,66.86 H, 5.30 N,13.00 66.97 5.08 13.5458 ##STR47## C 29.79 dimethylformamide, water 133.5-136.5 281(15,410) C,69.61 H, 5.15 N,14.33 69.10 5.08 14.1859 ##STR48## B 18.26 dimethylformamide, water 164.5-166.5 .sup.c C,56.16 H, 3.54 N,12.28 55.65 3.51 12.3760 ##STR49## A 51.07 isopropanol 142.5-145.5 223(14,420) C,68.32 H, 4.30 N,14.94 67.79 4.36 14.5861 ##STR50## B 15.68 isopropanol- ethanol 203.5-205 258(18,840) C,54.40 H, 2.28 N,11.90 53.78 2.30 12.1662 ##STR51## A 46.9 isopropanol 165.5-167.5 237(53,900) C,76.66 H, 4.83 N,13.41 76.29 4.84 13.2763 ##STR52## A 36.78 isopropanol- dimethylformamide 175-177 289(6,940) C,76.66 H, 4.82 N,13.41 76.68 4.75 12.01190 ##STR53## B 38.80 benzene 156-157.5 268(13,800) C,64.58 H, 5.42 N,11.89 64.58 5.39 12.02217 ##STR54## A 45.8 ethanol 134-136.5 273(14,900) C,66.86 H, 5.30 N,13.00 66.88 5.37 12.68__________________________________________________________________________ Notes: .sup.a isolated as hemihydrate. .sup.b partial loss prevented yield determination. .sup.c Compound absorbed too low for significant U.V.
Alkyl-2-(1-imidazolyl)phenylureylenes (Table III) were prepared by the reaction of equimolar amounts of the aminophenylimidazole and the appropriate isocyanate in toluene solution at steam bath temperatures during two or three hours. Upon cooling, the crude product was collected by filtration and treated by one of the following methods: (A) direct crystallization from the appropriate solvent or (B) dissolved in hot dimethylformamide and precipitated with water followed by crystallization.
TABLE III__________________________________________________________________________ ##STR55##Alkyl-2-(1-imidazolyl)phenylureylenes Isolation % Crystallization AnalysisNo. R Method Yield Solvent m.p., .degree.C. .lambda.max. (Am) Calc'd Found__________________________________________________________________________64 CH.sub.3 A 41.6 ethanol 194-196 240(15,500) C,61.60 61.22 H, 5.59 5.48 N,25.91 26.1165 CH.sub.3 CH B 27.3 trichloroethylene 173-175 278(1,200) C,62.59 62.21 242(12,700) H, 6.13 6.04 N,24.33 24.3266 CH.sub.3 CH.sub.2 CH.sub.2 B 49.3 trichloroethylene 139-141 279(1,200) C,63.92 63.75 240(12,800) H, 6.60 6.56 N,22.93 23.0067 CH.sub.3 CH.sub.2 CH.sub.2 CH.sub.2 B 35.6 isopropanol 115-116.5 278(1,400) C,65.09 64.84 241(15,000) H, 7.02 7.00 N,21.69 21.7868 ##STR56## A 50.64 dimethylformamide, water 164-166 241(12,200) C,67.58 H, 7.09 N,19.70 67.60 7.08 19.44__________________________________________________________________________
Aryl-2-(1-imidazolyl)phenylureylenes (Table IV) were prepared by reacting equimolar amounts of the aminophenylimidazole and the appropriate arylisocyanate in dry toluene during three hours at steam bath temperatures. The reaction mixture was cooled and the crude product was separated by filtration, and washed with ether and crystallized from the indicated solvent.
TABLE IV__________________________________________________________________________ ##STR57##Aryl-2-(1-imidazolyl) phenylureylenes Recrystallization AnalysisNo. Ar % Yield Solvent m.p. .degree.C. .lambda.max. Calc'd Found__________________________________________________________________________69 ##STR58## 64.6 ethanol 201-203 256(27,640) C,69.05 H, 5.07 N,20.13 69.13 5.15 20.1670 ##STR59## 76.9 dimethylformamide- water 203.5-207.5 258(23,400) C,69.84 H, 5.52 N,19.17 69.85 5.47 19.2871 ##STR60## 76.9 ethanol 182-183.5 256(25,800) C,69.84 H, 5.52 N,19.17 69.97 5.35 19.1272 ##STR61## 78.8 dimethylformamide- water 202.5-203.5 251(25,500) C,64.86 H, 4.42 N,18.91 64.77 4.47 19.1673 ##STR62## 61.9 dimethylformamide- water 201-202 253(26,000) C,64.86 H, 4.42 N,18.97 64.47 4.40 19.2474 ##STR63## 65.8 dimethylformamide- water 220-222 251(23,100) C,64.86 H, 4.42 N,18.97 64.56 4.41 19.1475 ##STR64## 76.7 dimethylformamide- water 204-206 258(30,900) C,61.45 H, 4.19 N,17.91 61.57 4.12 18.2676 ##STR65## 58.1 dimethylformamide- water 244-245.5 260(32,900) C,55.35 H, 3.48 N,16.14 54.93 3.47 16.2577 ##STR66## 70.0 dimethylformamide- water 180.5-182.5 252(23,000) C,53.80 H, 3.76 N,15.68 53.88 3.78 15.6678 ##STR67## 75.2 dimethylformamide- water 218-219.5 258(28,600) C,53.80 H, 3.67 N,15.68 53.71 3.66 15.3579 ##STR68## 53.1 methanol 227-230.5 260(27,700) C,53.80 H, 3.67 N,15.68 52.08 3.56 15.1280 ##STR69## 83.2 dimethylformamide- water 201-202 253(26,000) C,64.86 H, 4.42 N,18.97 64.47 4.40 19.2481 ##STR70## 57.79 dimethylformamide- water 167-170 250(20,710) C,69.84 H, 5.52 N,19.17 70.10 5.57 18.6082 ##STR71## 77.4 dimethylformamide- water 216.5-218.5 256(31,010) C,58.96 H, 3.78 N,16.18 58.86 3.81 15.7983 ##STR72## 78.9 dimethylformamide- water 212-215 260(27,580) C,70.57 H, 5.92 N,18.29 70.30 5.83 18.0084 ##STR73## 76.6 dimethylformamide- water 185-188 258(29,590) C,70.57 H, 5.92 N,18.29 70.30 5.96 18.0085 ##STR74## 76.2 dimethylformamide- water 163.5-166 258(28,770) C,70.57 H, 5.92 N,18.29 70.52 5.81 17.9486 ##STR75## 67.8 dimethylformamide- water 169-172 257(29,920) C,71.83 H, 6.63 N,16.75 71.61 6.56 16.2487 ##STR76## 80.6 dimethylformamide- water 206-209 282(27,620) C,71.23 H, 6.29 N,17.49 71.12 6.12 17.2488 ##STR77## 69.0 dimethylformamide- water 204.5-206 285(10,630) C,66.22 H, 5.23 N,18.17 65.96 5.15 18.1589 ##STR78## 84.0 dimethylformamide- water 188 252(25,510) C,66.22 H, 5.23 N,18.17 65.83 5.13 18.0290 ##STR79## 81.9 dimethylformamide- water 200-202 260(24,560) C,66.22 H, 5.23 N,18.17 65.61 5.14 17.9891 ##STR80## 80.9 dimethylformamide- water 190.5-193 259(27,180) C,67.07 H, 5.63 N,17.38 66.80 5.62 17.1692 ##STR81## 79.5 dimethylformamide- water 178-179.5 258(26,490) C,68.55 H, 6.33 N,15.99 68.68 6.34 15.6293 ##STR82## 64.1 dimethylformamide- water 202.5-205 259(35,850) C,71.34 H, 4.90 N,15.13 71.14 4.93 14.7894 ##STR83## 75.1 dimethylformamide- water 189-191 278(32,130) C,62.94 H, 4.97 N,17.27 62.84 4.86 17.2295 ##STR84## 62.3 dimethylformamide- water 211.5-214.5 259(30,210) C,61.45 H, 4.19 N,17.91 60.94 4.02 17.7996 ##STR85## 75.9 dimethylformamide- water 198-210 252(25,230) C,61.44 H, 3.85 N,17.83 61.33 3.92 17.9897 ##STR86## 64.8 dimethylformamide- water 232.5-234 258(32,380) C,55.35 H, 3.48 N,16.14 55.60 3.50 16.0098 ##STR87## 70.7 dimethylformamide- water 237.5-239 258(31,300) C,62.48 H, 4.63 N,17.15 62.79 4.70 17.3099 ##STR88## 70.0 dimethylformamide- water 229-232 256(25,630) C,58.10 H, 3.66 N,16.94 57.84 3.56 16.90100 ##STR89## 57.6 dimethylformamide- water 239.5-242.2 261(37,430) C,53.63 H, 3.18 N,14.71 53.89 3.05 14.41101 ##STR90## 50.7 dimethylformamide- water 190-192 255(26,350) C,53.63 H, 3.18 N,14.71 53.70 2.97 14.90102 ##STR91## 42.7 dimethylformamide- water 202-205 375(4,200) 253(32,970) C,59.44 H, 4.05 N,21.66 59.40 4.10 21.44103 ##STR92## 44.2 dimethylformamide- water 237.5-239-5 342(1,800) 264(46,530) C,59.44 H, 4.05 N,21.66 59.16 4.10 21.31104 ##STR93## 52.3 dimethylformamide- water >257(Dec.) 330(20,010) C,59.44 H, 4.05 N,21.66 59.01 3.97 21.07105 ##STR94## 35.4 dimethylformamide- water 256.5-258 257(33,080) C,53.72 H, 3.38 N,19.57 53.72 3.31 19.63106 ##STR95## 57.1 dimethylformamide- water 254-256 (Dec.) 256(36,930) C,60.53 H, 4.48 N,20.76 60.26 4.34 20.68107 ##STR96## 47.3 dimethylformamide- water 244 290(57,510) C,67.32 H, 4.32 N,23.09 67.88 4.13 21.37108 ##STR97## 33.8 dimethylformamide- water 227.5-229.5 297(32,710) C,67.48 H, 5.03 N,17.49 67.49 5.05 17.07191 ##STR98## 35.2 dimethylformamide- water 233-236 284(16,710) C,73.15 H, 4.91 N,17.06 72.70 4.97 16.63192 ##STR99## 25.2 dimethylformamide- water 231-232 252(32,920) C,56.31 H, 3.55 N,20.52 54.13 3.50 20.21__________________________________________________________________________
4-Alkylimidazo[1,2-a]quinoxalines (Table V) were prepared by refluxing the appropriate amide (Table I, compounds 1-33) with phosphorous oxychloride in excess pyridine during one hour. The reaction mixture was stirred into water and sufficient azeotrope removed to form a viscous residue which was dissolved in chloroform, dried over MgSO.sub.4, and chromatographed through an alumina column. The chloroform was evaporated and the product crystallized from the indicated solvent.
TABLE V__________________________________________________________________________ ##STR100##4-alkylimidazo[1,2-a] quinoxalines Recrystallization AnalysisNo. R % Yield Solvent m.p. .degree.C. .lambda..sub.max.(Am) Calc'd Found__________________________________________________________________________109 H a 63.3 sublimed 120 316(10,900)110 CH.sub.3 13.3 isopropyl ether 134-135 312(11,200) C,72.11 72.18 H, 4.95 4.89 N,22.93 23.01111 CH.sub.3 CH.sub.2 37.6 hexane 114-115 311(10,500) C,73.07 72.85 H, 5.62 5.83 N,21.30 21.29112 CH.sub.3 CH.sub.2 CH.sub.2 14.3 hexane 110-111 314(10,900) C,73.91 73.99 H, 6.20 6.13 N,19.89 19.94113 CH.sub.3 (CH.sub.2).sub.3 17.6 hexane 92-93 324(8,000) C,74.64 74.34 H, 6.70 6.74 N,18.65 18.48114 CH.sub.3 (CH.sub.2).sub.4 29.2 b. 63-65 314(11,300) C,75.28 75.13 H, 7.16 7.39 N,17.56 17.43115 CH.sub.3 (CH.sub.2).sub.5 10.7 b. 43-45 313(10,800) C,75.86 76.03 H, 7.56 7.63 N,16.59 16.40116 CH.sub.3 (CH.sub.2).sub.6 8.0 c. 54-57 313(9,400) C,76.37 75.84 H, 7.92 7.77 N,15.72 16.43117 CH.sub.3 (CH.sub.2).sub.7 26.3 isopropyl ether 65-66 311(11,600) C,76.83 76.97 H, 8.24 8.20 N,14.93 14.89118 CH.sub.3 (CH.sub.2).sub.8 9.5 ethyl ether- 55-57 307(12,500) C,77.25 77.04 hexane H, 8.53 8.36 N,14.22 14.52119 CH.sub.3 (CH.sub.2).sub.14 24.3 isopropyl ether 73-75 313(11,300) C,79.11 79.03 H, 9.82 10.02 N,11.07 10.88120 CH.sub.3 (CH.sub.2).sub.16 13.7 isopropyl ether 79-81 311(11,300) C,79.11 79.54 H,10.14 10.12 N,10.31 10.34121 (CH.sub.3).sub.2 CHCH.sub.2 12.6 hexanes 52-55 314(11,700) C,74.64 74.92 H, 6.71 6.81 N,18.65 18.74122 CF.sub.3 50.7 isopropyl ether- 184-187 328(10,800) C,55.70 55.94 chloroform H, 2.55 2.49 N,17.72 17.64123 CH.sub.2CH(CH.sub.2).sub.8 9.8 hexanes 40-42 309(13,100) C,78.14 77.92 H, 8.20 7.98 N,13.67 13.96124 ##STR101## 16.7 ethanol 140.5-142 312(13,100) C,78.74 H, 5.05 N,16.20 78.59 5.20 16.10125 CH.sub.3 OCH.sub.2 3.1 toluene-hexane 96.5-97.5 312(10,600) C,67.59 67.04 H, 5.20 5.17 N,19.71 19.93126 ##STR102## 14.5 ethanol 146.5-148.5 314(10,400) C,74.17 H, 4.76 N,15.25 74.28 4.61 15.00127 ##STR103## 37.2 benzene 164-167 286(10,500) C,79.68 H, 4.83 N,15.49 80.38 4.91 15.12128 ##STR104## 17.9 hexane 106.5-107.5 310(11,500) C,75.31 H, 5.87 N,18.82 75.32 5.84 18.75129 ##STR105## 2.0 hexane 119-120.5 311(11,400) C,76.46 H, 6.82 N,16.72 76.65 6.76 16.58130 ##STR106## 0.8 isopropyl ether 133-135 312(11,700) C,77.39 H, 5.68 N,16.92 77.20 6.13 16.76__________________________________________________________________________ Notes: a A.M.Siminov and I.G. Urykina, Khim. Geterot Soedin., 7,570(1971) report this compound has an mp of 124.degree. with .lambda..sub.max.sup.MeOH. (Am) = 315(10,700). b. Purified by sublimation at 90.degree./0.15 mm Pressure. c. Purified by distillation at 174-184.degree./0.40 mm P.
4-Arylimidazo[1,2-a]quinoxalines (Table VI) were prepared and isolated according to the general method described for the 4-alkylimidazo[1,2-a]quinoxalines, except as noted in Table VI.
TABLE VI__________________________________________________________________________ ##STR107##4-Arylimidazo(1,2-a)quinoxalines % Crystallization AnalysisNo. Ar Yield Solvent m.p. .degree.C. .lambda.max.(Am) Calc'd Found__________________________________________________________________________131 ##STR108## 34.8 benzene 145-147 328(14,100) C,78.35 H, 4.52 N,17.13 78.70 4.38 16.90132 ##STR109## 37.2 toluene- isopropanol 149-150.5 334(22,650) C,78.74 H, 5.05 N,16.20 78.89 5.08 16.27133 ##STR110## 35.9 isopropanol- isopropyl ether 112-114 329(15,400) C,78.74 H, 5.05 N,16.20 78.53 5.19 16.20134 ##STR111## 47.1 isopropanol 119-120 329(18,100) C,78.74 H, 5.05 N,16.20 78.32 4.73 15.93135 ##STR112## 37.8 isopropanol 136-137 331(27,780) C,82.22 H, 4.70 N,13.07 82.06 4.38 12.89136 ##STR113## 47.0 isooctane 112-113 332(10,411) C,65.18 H, 3.22 N,13.41 65.03 3.10 13.62137 ##STR114## 56.7 hexanes 105-107 329(20,354) C,79.70 H, 6.35 N,13.94 79.59 6.58 13.84138 ##STR115## 37.2 isopropanol- toluene 149-150.5 334(22,650) C,74.17 H, 4.76 N,15.26 74.18 4.79 15.33139 ##STR116## 51.5 isopropanol 136-138 329(16,600) C,70.81 H, 4.95 N,13.76 70.61 5.06 13.56140 ##STR117## 31.5 ethanol 173-175 328(16,280) C,68.70 H, 3.60 N,15.02 69.06 3.28 15.08141 ##STR118## 6.8 benzene- hexanes 166-168 331(10,300) C,68.70 H, 3.60 N,15.02 68.77 3.48 14.87142 ##STR119## 35.2 isopropanol 133-134 330(14,000) C,68.70 H, 3.60 N,15.02 68.43 3.45 14.89143 ##STR120## 61.9 toluene 215-217.5 333(16,530) C,61.16 H, 2.89 N,13.37 60.94 2.82 13.50144 ##STR121## 3.4 carbon tetra- chloride 168-170 321(13,030) C,61.17 H, 2.89 N,13.37 60.61 2.85 13.57145 ##STR122## 24.1 dimethylformamide- water 161.5-164.5 319(10,200) C,59.28 H, 3.11 N,12.96 58.75 3.03 12.90146 ##STR123## 13.4 dimethylformamide- water 172 329(12,900) C,59.28 H, 3.11 N,12.96 59.34 3.13 13.23147 ##STR124## 39.1 isopropanol 183-185 328(14,500) C,72.99 H, 3.83 N,15.96 73.00 4.06 15.77148 ##STR125## 15.0 ethanol 190-192 222(48,000) C,70.58 H, 3.83 N,14.52 70.54 3.71 14.67149 ##STR126## 53.3 dimethylformamide- water 257.5-259.5 335(14,900) C,75.54 H, 3.73 N,20.73 75.15 3.85 20.66150 ##STR127## 59.8 2-ethoxyethanol 220.5-222.5 333(13,850) C,66.20 H, 3.47 N,19.30 66.10 3.48 19.53151 ##STR128## 40.3 toluene 249-252 346(15,269) C,66.20 H, 3.47 N,19.30 66.10 3.44 19.28152 ##STR129## 52.5 dimethylformamide 283-285 340(10,880) C,57.30 H, 2.71 N,20.89 57.08 2.74 21.11153 ##STR130## 75.7 dimethylformamide- water 198-199.5 369(23,470) C,73.83 H, 4.65 N,21.53 73.48 4.69 21.54154 ##STR131## 61.9 dimethylformamide- water 130-133 326(14,830) C,73.83 H, 4.65 N,21.53 73.56 4.78 21.69155 ##STR132## 58.0 ethylacetate- hexane 214-217 342(27,700) C,68.88 H, 4.66 N,17.85 68.46 4.99 17.76156 ##STR133## 13.9 dimethylformamide- water 237.5-240 345(32,350) C,68.24 H, 3.90 N,13.84 68.54 3.90 14.00173 ##STR134## 32.3 ethanol 155-157 321(13,090) C,72.99 H, 3.83 N,15.96 72.44 3/83 16.14157 ##STR135## 56.6 dimethylformamide- water 134.5-136 332(14,260) C,59.28 H, 3.11 N,12.96 59.25 3.04 13.11158 ##STR136## 47.5 dimethylformamide- water 132.5-134 330(13,970) C,72.99 H, 3.83 N,15.96 73.00 3.79 15.84159 ##STR137## 52.7 ethanol 113-114.5 329(16,500) C,74.17 H, 4.76 N,15.26 74.09 4.71 15.05160 ##STR138## 10.62 chloroform 159-161.5 323((15,290) C,81.34 H, 4.43 N,14.23 81.29 4.41 14.22161 ##STR139## 43.2 benzene 154.5-156.5 340(21,800) C,81.34 H, 4.44 N,14.23 81.19 4.57 13.92162 ##STR140## 25.4 isopropanol 210-215 343(23,800) C,68.81 H, 4.69 N,15.04 68.99 4.63 14.92163 ##STR141## 84.2 ethanol 158-160 333(14,950) C,71.28 H, 4.32 N,13.85 71.31 4.44 13.85164 ##STR142## 80.3 ethanol 116-118 335(15,100) C,72.49 H, 5.17 N,12.68 72.38 5.42 12.36165 ##STR143## 62.6 ethanol 90.5-93.5 335(15,100) C,75.15 H, 7.03 N,10.11 74.87 7.16 9.94166 ##STR144## 45.85 chloroform 154-155.5 344(27,240) C,76.38 H, 8.51 N,11.14 76.58 8.35 10.81193 ##STR145## 29.80 ethanol 150-152 342(22,900) C,74.72 H, 5.23 N,14.52 74.37 5.17 14.33196 ##STR146## 8.2 dimethylformamide- water 178-181 330(27,300) C,51.77 H, 2.72 N,11.32 51.89 2.68 11.46219 ##STR147## 37.1 toluene 151.5-153.5 333(21,000) C,78.32 H, 4.48 N,12.45 78.32 4.63 12.22220 ##STR148## 35.1 benzene 151.5-153.5 337(22,200) C,75.19 H, 4.66 N,11.44 75.42 4.58 11.46221 ##STR149## 33.3 ethanol-water 300-330 343(22,700) C,72.92 H, 4.45 N,11.60 73.21 4.31 11.74222 ##STR150## 28.2 ethanol 83-85 348(24,600) C,72.04 H, 5.74 N,12.60 71.64 5.68 12.62194 ##STR151## 22.6 toluene 164-165.5 339(19,400) C,68.05 H, 5.11 N,12.53 67.70 5.03 12.32__________________________________________________________________________ Notes To Table VI: .sup.a U.S. Pat. No. 3,887,566 describes this compound as having a m.p. o 154-157.degree. C. .sup.b Prepared by refluxing equimolar amounts of the 2aminophenyl-imidazole and phthalic anlydride in toluene for one and one half hours. Upon cooling, the product separated out of solution. .sup.c Prepared by catalytic hydrogenation with 10% palladium on carbon o a dimethylformamide solution of the nitro analog; crude product precipitated with water. .sup.d Prepared by treating compound 153 in pyridine with the appropriate acid chloride followed by precipitation with water. .sup.e Prepared by HI cleavage of compound No.138. .sup.f Prepared by treating the lithium salt of compound No. 162 with the appropriate acid chloride in DMF followed by precipitation with water. .sup.g Prepared by treating compound No. 151 with the appropriate nucleophile according to the method of Kornblum et al, J. Org. Chem., 41, 1560(1976). .sup.h Prepared by HI cleavage of compound 220.
The 4-Alkylaminoimidazo[1,2-a]quinoxalines (Table VII) were prepared by treating the corresponding alkylureylenes (Table III) with phosphorous oxychloride and pyridine during one-half hour at reflux temperatures. The reaction mixture was poured into cold water and the excess pyridine was removed by azeotropic distillation. The crude product was dissolved in chloroform and pass through an alumina columa. After evaporation of the chloroform, the solid was crystallized from the indicated solvent and obtained in the indicated yield.
TABLE VII__________________________________________________________________________ ##STR152##4-Alkylaminoimidazo{1,2-a}quinoxalines % Crystallization AnalysisNo. R Yield Solvent m.p. .degree.C. .lambda.max. (Am) Calc'd Found__________________________________________________________________________167 ##STR153## 4.89 hexane 98.5-101.5 335(11,700) C,72.15 H, 6.81 N,21.04 72.02 6.75 20.81168 CH.sub.3 (CH.sub.2).sub.2 CH.sub.2 28.33 isopropyl ether 102-104 332(11,480) C,69.97 70.12 H, 6.71 6.71 N,23.31 23.21169 CH.sub.3 (CH.sub.2).sub.2 7.5 isopropyl ether 72-74 317(15,800) C,69.00 69.14 H, 6.24 6.35 N,24.76 24.60__________________________________________________________________________
4-Arylaminoimidazo[1,2-a]quinoxalines (Table VIII) were prepared by treating the corresponding arylureylenes (Table IV) with an equimolar amount of phosphorous oxychloride in refluxing pyridine during one hour. The cooled reaction mixture was stirred into cold water, and the crude solid which separated was dissolved in chloroform, dried and passed through an alumina column. The chloroform was evaporated and the crude solid crystallized as indicated in Table VIII.
TABLE VIII__________________________________________________________________________ ##STR154##4-Arylaminoimidazo(1,2-a)quinoxalines % Crystallization AnalysisNo. Ar Yield Solvent m.p..degree.C. .lambda.max.(Am) Calc'd Found__________________________________________________________________________170 ##STR155## 7.2 ethanol-water 120-123 304(13,800) C,72.57 H, 4.76 N,21.16 72.67 4.71 20.08171 ##STR156## 13.1 methanol- chloroform 151 334(20.700) C,74.43 H, 5.14 N,20.42 74.16 5.06 20.09172 ##STR157## 11.7 methanol- chloroform 153-155 330(20,200) C,74.43 H, 5.14 N,20.42 73.23 5.26 20.02174 ##STR158## 13.6 methanol- chloroform 176.5-178 330(22,200) C,65.26 H, 3.75 N,19.02 65.04 3.77 18.91175 ##STR159## 10.9 methanol- chloroform 178.5-180.5 344(33.600) C,58.38 H, 3.06 N,17.02 58.15 3.06 17.09176 ##STR160## 18.2 toluene- chloroform 193.5-195 332(4,500) C,49.76 H, 2.87 N,14.51 49.72 3.10 14.39177 ##STR161## 11.5 ethanol 196.5-198.5 324(16,600) C,56.66 H, 3.27 N,16.52 56.69 3.24 16.43178 ##STR162## 15.0 methanol- chloroform 184-185.5 329(24,100) C,56.66 H, 3.27 N,16.52 56.26 3.20 16.54179 ##STR163## 10.52 dimethylformamide water 122-124 343(19,600) C,63.27 H, 3,98 N,18.45 62.94 4.19 18.58180 ##STR164## 13.0 ethanol-dimethyl- formamide 139 339(19,810) C,69.05 H, 3.98 N,20.13 68.88 4.02 20.13181 ##STR165## 9.4 isopropanol 148.5-149.5 343(20,230) C,69.05 H, 3.98 N,20.13 68.92 4.00 20.14182 ##STR166## 3.1 isopropanol 139.5-141 331(18,030) C,69.05 H, 3.98 N,20.13 68.50 3.92 19.86183 ##STR167## 16.58 dimethylformamide- water 166-168.5 347(21,730) C,56.66 H, 3.27 N,16.52 56.31 3.25 16.56184 ##STR168## 11.4 dimethylformamide- water 207-209 366(22,410) C,70.33 H, 4.86 N,19.30 70.61 5.11 19.11185 ##STR169## 8.3 dimethylformamide- water 116.5-11.7.5 335(21,820) C,70.33 H, 4.86 N,19.30 70.16 5.28 19.31186 ##STR170## 14.12 dimethylformamide- water 147-149 339(18,540) C,70.33 H, 4.86 N,19.30 70.14 4.98 19.09187 ##STR171## 2.0 isopropanol-dimethyl- formamide 195-197 341(20,370) C,60.28 H, 3.95 N,21.97 60.21 3.88 21.63188 ##STR172## 36.4 dimethylformamide- water 241-243.5 400(8,960) C,62.95 H, 3.63 N,22.94 62.62 3.63 22.68186 ##STR173## 33.1 dimethylformamide- water 323-324.5 368(23,670) C,62.95 H, 3.63 N,22.94 62.73 3.73 22.81195 ##STR174## 11.61 dimethylformamide- water 138.5-141 335(22,900) C,74.99 H, 4.58 N,15.90 75.02 4.66 75.02197 ##STR175## 5.52 dimethylformamide- water 143-145 330(18,000) C,74.43 H, 5.15 n,20.42 74.63 5.16 20.09198 ##STR176## 10.91 dimethylformamide 163.5-165.5 337(18,800) C,74.98 H, 5.59 N,19.43 74.69 5.56 19.43199 ##STR177## 15.29 dimethylformamide- water 81-83 333(20,800) C,73.83 H, 5.51 N,19.13 73.87 5.49 18.88200 ##STR178## 13.81 dimethylformamide- water 124.5-127 335(23,200) C,73.83 H, 5.51 N,19.13 74.14 5.47 19.02201 ##STR179## 16.96 isopropanol- water 89.5-91.5 335(21,000) C,73.83 H, 5.51 N,19.13 74.14 5.47 19.02202 ##STR180## 11.50 methanol- chloroform 187-190 342(24,200) C,76.29 H, 4.56 N,17.00 76.58 4.52 17.58203 ##STR181## 12.50 dimethylformamide- water 120.5-123 340(20,300) C,68.99 H, 5.15 N,17.88 68.32 5.32 17.61204 ##STR182## 21.39 dimethylformamide- water 102.5-107 340(19,600) C,62.20 H, 3,38 N,17.07 61.56 3,34 17.46205 ##STR183## 8.5 dimethylformamide- water 90-97 341(26,400) C,65.68 H, 4.62 N,18.02 65.56 4.57 17.88206 ##STR184## 21.39 dimethylformamide- water 129-130 347(20,300) C,62.20 H, 3.38 N,17.07 61.56 3.34 17.46207 ##STR185## 11.49 dimethylformamide- water 178.5-179.5 324(25,500) C,56.29 H, 2.78 N,15.45 55.86 2.72 15.37208 ##STR186## 7.52 dimethylformamide- water 172.5-173.5 345(24,900) C,56.29 H, 2.78 N,15.45 56.13 2.72 15.35209 ##STR187## 15.18 dimethylformamide- water 170-172 332(23,800) C,65.18 H, 4.18 N,17.89 65.35 4.15 17.91210 ##STR188## 13.56 dimethylformamide- water 171.5-173 337(17,300) C,64.86 H, 3.40 N,18.91 64.92 3.51 19.00211 ##STR189## 10.78 dimethylformamide- water 259.5-261.5 342(23,200) C,56.82 H, 3.28 N,16.57 56.76 3.07 16.57212 ##STR190## 7.22 dimethylformamide- water 198-200 343(18,400) C,61.45 H, 3.22 N,17.92 61.35 3.27 17.81213 ##STR191## 3.04 methanol-chloroform 229-231 341(19,900) C,58.63 H, 3.15 N,21.36 58.50 3.06 21.20214 ##STR192## 4.18 methanol-chloroform 168-170 344(21,400) C,63.06 H, 4.12 N,21.63 62.97 4.08 21.34215 ##STR193## 19.43 dimethylformamide- water 271-273 346(19,600) C,56.57 H, 2.97 N,20.61 56.44 2.90 20.51216 ##STR194## 5.96 dimethylformamide- water 224-226.5 349(34,700) C,70.48 H, 3.91 N,24.17 70.89 3.94 24.09218 ##STR195## 2.31 isopropanol 95-96.5 -- C,75.47 H, 6.00 N,18.53 75.08 6.34 18.53__________________________________________________________________________
Various compounds of this invention display antifungal and anti-yeast activity. Thus, for example, they have been found to be effective against such organisms as Candida albicans (ATCC No. 10231), Candida tropicalis, Aspergillus niger (ATCC No. 16404), Trichophyton mentagrophytes (ATCC No. 8757 and 9129), Trichophyton rubrum (ATCC No. 10218 and 14001) and Trichophyton ajelloi.
The antifungal activity of compounds of this invention indicate their usefulness against dermatomycosis such as tinea capitis, tinea favosa, tinea barbae, tinea corporis, tinea imbricata, tinea cruris, tinea pedis, tinea manus, tinea unquium and various types of candidiasis such as glossitis, stomatitis, chelitis, perleche, vaginitis and balanitis.
When the compounds of the present invention are used for antifungal medical purposes, they will usually be incorporated in a suitable pharmaceutical carrier. These antifungal preparations may take the form of solutions, lotions, creams, ointments, etc. The quantity of antifungal agent of this invention that will be contained in such preparations may vary somewhat. Ordinarily, however, it will constitute about 0.5% to 10.0% by weight based on the total weight of the preparation.
In Table IX below are listed the antifungal activity of a number of compounds encompassed in the present invention. These were determined by the agar dilution method as described in Chapters 2 and 3 of Methods in Microbiology, Vol. 7B, edited by J. R. Norris and D. W. Ribbons, Academic Press, New York, 1972.
TABLE IX______________________________________Antifungal ActivityParts Per Million Inhibitions ofFungus and Yeast SpeciesCom-pound C. C. A. T. T. menta- T.No. albicans tropicalis niger ajelloi grophytes rubrum______________________________________20 100 100136 10040 100 100 100 10035 100 1639 100 100133 100 100 8 8 8134 100 16139 100137 100 100135 100 100142 100132 100 100138 100 100130 100 100 100 100113 100 100 1009 16 1610 16 16116 16 16127 16 16109 128 32114 16 1118 256 4123 2131 16 2140 <0.5151 1119 8120 18 8 816 4 2110 128 128 64122 32112 128 64153 100124 100 100 100 100 858 100 100 10059 10062 100 100 100126 100 100 100145 100 100 100159 100 100 100160 100 100 100163 100 100 100164 100 100 100165 100 100 100167 100 100 100168 100 100 100169 100 100 100173 100 100 100179 100 100 100182 100184 100 100 100185 100 100 100186 100 100 100189 100 100187 100 100128 16129 16 16 8______________________________________
A number of the compounds encompassed in the present invention have been found to have immunosuppressant action. Of those tested, most of these are of the 4-substituted imidazo[1,2-a]quinoxaline type described in formula I above, although a couple are of the 1-(2-acylaminophenyl)imidazole type shown in formula II. Because they exhibit this activity, they are indicated for use in the treatment of those diseases that the prior art recognizes may be helped by the administration of immunosuppressants. These include such conditions as- glomerulonephritis, serum sickness, organ transplant, rheumatoid arthritis, systemic lupus erythematosis, ulcerative colitis, chronic active hepatitis, multiple sclerosis, heterografts or homografts in burns, psoriatic arthritis, urticaria, respiratory allergies, i.e. asthma, hayfever; scleraclerma, mycosis fungoides, dermatomyositis, psoriasis and contact dermatitis (including poison ivy).
The dosage level for administering the immunosuppressants of the present invention will vary with the particular compound that is to be administered. In general, this will be at about the same level of the prior art immunosuppressants. For the most part, when the present immunosuppressants are administered orally or intraveneously, the daily dose would be in the range of about 0.1 mg. to 15 mg./per kilogram of body weight. When other mode of administration are employed, e.g. depot injections, implants, etc. the dose may be considerably higher i.e. up to about 100 mg./kg of body weight in a single injection.
The immunosuppressant activities of the compounds of this invention were determined via the hemolysin test in mice and by the delayed hypersensitivity test. The hemolysin test used is that described in Methods in Immunology, edited by D. H. Campbell et al, W. A. Benjamin, New York 1963 pages 172-175, and measures humeral or antibody response. The delayed hypersensitivity test measures the effect of a test compound on the ability of a subject mouse to mount a cell-mediated immune response to the antigen, Mycobacterium tuberculosis H37Ra. The mouse is sensitized to the antigen by subcutaneous administration in the base of the tail. The development of the delayed hypersensitivity response may be measured at any time beginning six days after sensitization but is usually done on the ninth day as follows: The right hind paw is injected with purified protein derivative (tuberculin) while the left hind paw (control) receives physiological saline. Both paw volumes are measured after twenty-four hours and significant increase in the volume of the right hand paw is taken as a measure of an effective delayed hypersensitivity response. All compounds were administered by the subcutaneous route.
The results of these studies are summarized in Table X below. The expression HL(ED.sub.50) mg./kg. s.c. is an expression of the number of milligrams per kilogram of body weight of the drug administered subcutaneously required to reduce the antibody activity by 50% when compared with a control. In this case, the lower the HL(ED.sub.50) value for a drug the more effective immunosuppressant it is.
The D.H.S. (ED.sub.60) mg./kg. s.c. value appearing in column 3 is an expression of the effectiveness of the drug in reducing the edema that accompanies the cell-mediated immune response. It is a measure of the number of milligrams per kilogram of body weight of the drug administered subcutaneously which is required to reduce the edema of the cell-mediated immune response by 60% when compared to the control. Again, the lower the D.H.S. (ED.sub.60) value the more effective is the drug as an immunosuppressant for the cell-mediate immune response.
TABLE X______________________________________Compound HL(ED.sub.50) D.H.S. (ED.sub.60)No. mg/kg, s.c. mg/kg, s.c.______________________________________151 0.3 1.52140 0.26 1.15131 18 81116 >50 56117 >50 46118 >50 43109 >50 >50110 -- 503 50 5066 46 >50147 0.027 1.7134 0.5 7.2137 <0.125 3.2135 0.033 0.22142 0.20 4.2136 2.7 >50133 0.75 32139 3.0 >50138 0.72 27127 >50 36170 6.6 >50150 22 >50143 0.36 1.3174 0.61 8.0171 0.96 59.0175 0.09 5.9178 11.0 46.0196 0.42 45.0197 1.6 373 50.0 50.0169 46 >50.0146 0.11 3.1153 1.2 5.7149 0.16 8.8126 35.0 >50.0177 13.0 >50.0182 1.1 --162 13.0 --173 -- 40159 3.0 27181 16.0 --180 5.6 --183 0.39 15158 1.0 7.6157 0.39 12218 1.5 25219 2.5 >32220 2.3 11222 1.0 > 32______________________________________ >50 means that it would take more than 50 mg./kg. of drug to reduce the humeral antibody activity by 50% or to reduce edema of the cell mediated immune response by 60%. Since these values are higher than is of practica interest from a clinical point of view, no further testing was done for these materials.
A number of compounds encompassed in the present invention display non-steroidal anti-inflammatory properties. This appears to be generally the case for the 4-substituted imidazo[1,2-a]quinoxalines of formula 1 above and the 1-(2-acylaminophenyl)imidazoles of formula II. Because of this characteristic, they are indicated for use in the treatment of diseases that the prior art recognizes may be helped by the administration of non-steroidal anti-inflammatory compounds. These include such conditions as ichthyosis, psoriasis, alopecia, atopic eczemas, etc.
The dosage level for administering the anti-inflammatory agents of the present invention may vary somewhat depending on the particular drug selected, the disease being treated and the mode of administration. In general, however, when used for topical application, the compounds are distributed in a pharmaceutical vehicle suitable for topical application. In these compositions, the anti-inflammatory agent of this invention will comprise about 0.5% to 15.0% by weight based on the total weight of the composition.
The anti-inflammatory agents of the present invention may also be administered orally, intravenously, subcutaneously, intramuscularly, and intradermally. In these cases, the daily dosage will be in the range of from 0.5 mg. to 20 mg. per kilogram of body weight of the active anti-inflammatory agents of this invention.
The anti-inflammatory activity of representative compounds of this invention was determined by the rat paw edema assay both by local administration (Table XI below) and by oral dosing (Table XII below). For the oral dosing, the procedure of C. A. Winter, E. A. Risley and G. W. Nuss, Proc. Soc. Exp. Biol. Med. 111, 544 (1962) was employed with measurement taken four hours after the drug was administered. The local administration tests were carried out similarly except the irritant (carrageenan) and the test compound were injected simultaneously at time zero.
Tables XI and XII report the anti-inflammatory activity of the compounds tested as % difference in the edema or swelling as compared with the control. These Tables also give the response in many instances of more than one dose level of the same drug.
TABLE XI______________________________________Rat Paw Edema Assay,Local Administration(injected directly into paw)% Difference from ControlCompound No. 1.mu.g 10.mu.g 100.mu.g 100 mg/kg______________________________________148 -32.6 -53.5 -14.3 -39109 -30.8 -3.9 +31.6114 -68.2 -30.0 -131.6117110 -74122 -6149 -357 -2251 -57140 -78______________________________________
TABLE XII______________________________________Rat Paw Edema Assay, Oral Dosing %Difference from ControlCompound No. 100 mg/kg 400 mg/kg______________________________________Indomethacin -65phenybutazone -76Aspirin -57114 -61110 -43122 -61148 -5249 -357 -5251 -57140 -35131 -5210 -3039 -50133 -17137 -26112 -17 -68111 -43121 -61147 -39134 -43139 -22 -25132 -76150 -30144 -26115 +70 -25117 -7 -18123 0 -50116 +104 -18136 -9 -258 -22 -1329 -24 -2514 -5220 -5938 -4157 -3550 -20 -3345 -3340 -4335 -5037 -3518 -2815 -24 -555 -2652 -262 -26 +4323 -4625 -3030 + 9 -3336 -7 -6842 -9 -2524 -17 -25109 -1771 -2275 -3068 -2673 -22128 -39129 -30______________________________________

Process for preparing 4-substituted imidazo[1,2-a]quinoxalines

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