NO118669B

1,133,850. Aminothiophene derivatives. FARBWERKE HOECHST A.G. 12 April, 1966 [10 April, 1965], No. 15940/66. Heading C2C. Novel aminothiophene derivatives have the formula where R is a phenyl radical containing one or more substituents which may be a halogen atom, CF 3 , C 1-4 alkyl or C 1-4 alkoxy, phenyl-C 1-4 alkoxy which may be substituted in the phenyl ring by halo, C 1-4 alkyl or C 1-4 alkoxy, and C 5-6 cycloalkyl, or R may represent a tetrahydronaphthalene or indane radical; R 1 is a carboxylic, carbonamide, or carboxylic ester group containing in the ester group (a) an alkyl, dialkyl - amino - alkyl, or alkylene - iminoalkyl radical having 4-5 ring carbons which may be interrupted by O or where each alkyl is C 1-4 ; or (b) a phenyl radical which may be substituted by halo, C 1-4 alkyl or C 1-4 alkoxy; or (c) a phenyl-C 1-4 alkyl radical; and R 2 and R 3 each represents H or C 1-4 alkyl. The novel compounds may be obtained: (1) by condensing a compound of formula where R 4 = R 1 or CN, with R-NH 2 to yield a 3 - amino - 2,5 - dihydrothiophene which is dehydrogenated by known methods and if R 4 = CN it is converted to R 1 ; (2) by condensing a compound of formula with RY, where one of X or Y is amino and the other a halogen atom, and if necessary dehydrogenating and converting R 4 to R 1 ; (3) by de-acylating a compound corresponding to (I) (which may be partially or completely hydrogenated) having an acyl group in place of the H attached to the N atom, and optionally dehydrogenating the product and converting R 4 to R 1 . 4-Cyano-thiophanone is obtained introducing a mixture of acrylonitrile and thioglycolic acid methyl ester into fresh sodium methylate. and refluxing. 3 - (R - substituted - anilino) - 4 - cyano - 2,5- dihydrothiophenea are obtained by reacting 4- cyanothiophane with an R-substituted aniline. 3 - (R - substituted - anilino) - 4 - cyano - thiophenes are obtained by dehydrogenation of the corresponding 2,5-dihydrothiophenes by boiling with tetrachloroquinone. Pharmaceutical compositions having antiphlogistic and anti-pyretic properties comprise compounds of Formula I together with a pharmaceutically suitable carrier in forms such as tablets, dragees, solutions, suppositories, ointments and powders.