Patent GB-1277743-A (GB)
Title: NEW [1]BENZOTHIENO[2,3-d]PYRIMIDINE DERIVATIVES AND PROCESS FOR THEIR MANUFACTURE
IPC: C07C45/67
Filed: 1969-07-10
Abstract: 1277743 [1]Benzothieno[2,3-d]pyrimidines CIBA GEIGY AG 10 July 1969 [15 July 1968 5 June 1969] 34766/69 Heading C2C Novel 1]benzothieno[2,3-d]pyrimidines of the general formula wherein A is an amino-C 1-8 -alkylamino group, one of R A , R B , R C  and R D  is an optionally substituted phenyl group and the others, as well as R A <SP>1</SP>, R B <SP>1</SP>, R C <SP>1</SP> and R D <SP>1</SP>, are C 1-6  alkyl or optionally substituted phenyl-C 1-6  alkyl or phenyl groups or hydrogen atoms, or R A 1, R B <SP>1</SP>, R c 1 and R D <SP>1</SP> together form a system of two conjugated double bonds, and R 6  is a C 1-8  alkyl, C 2-8  alkenyl, C 1-8  cycloalkyl, cycloalkylalkyl or optionally substituted phenyl-C 1-6  alkyl group or a hydrogen atom, and salts thereof are prepared (a) by reaction of the corresponding 4-halo-[1]benzothieno[2,3-d]pyrimidine with an aminoalkylamine of the general formula AH; (b) by reaction of the corresponding 4-Yo-[1]benzothieno[2,3- d]pyrimidine, wherein Yo is a reactive esterified hydroxy-C 1-8  alkylamino group, with ammonia or an amine which has at least one hydrogen atom attached to the nitrogen atom; and (c) when at least one nitrogen atom of the amino- C 1-8  alkylamino group A carries at least one hydrogen atom, by hydrogenolysis of the corresponding compound in which at least one nitrogen atom of the amino-C 1-8  alkylamino group carries at least one α-aralkyl group; followed optionally by N-alkylation of a resulting compound having at least one hydrogen atom at any of the nitrogen atoms of the amino-C 1-8  alkylamino group and/or splitting a resulting isomer mixture into the pure cis- and trans-isomers and/or resolving a resulting racemate into the optical antipodes and/or converting a resulting free base into a salt or a resulting salt into the free base. 4-Halo-[1]benzothieno[2,3-d]pyrimidines and 5,6,7,8-tetrahydro derivatives thereof are prepared by halogenation of the corresponding 4- hydroxy - [1]benzothieno[2,3 - d]pyridimine or 5,6,7,8-tetrahydro derivative thereof, which is obtained by reaction of a 2-amino-3-Z<SP>11</SP>-6,7- dihydro- or 4,5,6,7-tetrahydrobenzo[6]thiophene wherein Z<SP>11</SP> is a free or functionally converted carboxyl group containing an oxo group, with a reactive derivative of a carboxylic acid, with the proviso that at least Z<SP>11</SP> or the functionally converted carboxyl group of the said carboxylic acid contains a nitrogen atom. 2-Amino-3-Y<SP>11</SP>-6,7- dihydro- or 4,5,6,7-tetrahydrobenzo[6]thiophenes wherein Y<SP>11</SP> is a free or functionally converted carboxyl group are prepared by reaction of a cyclohexanone optionally containing a double bond in the 5,6-position with a nitrile of the general formula Y<SP>11</SP>-CH 2 CN and simultaneously or subsequently with sulphur. 3,5-Bis-(pchlorophenyl}-cyclohexanone is prepared by reaction of 4,4<SP>1</SP>-dichlorochalcone with acetoacetic acid ester, heating of the resulting 1,5-bis-(pchlorophenyl ) -4-carbethoxycyclohexen-3-one with hydrochloric acid and reduction of the resulting 1 ,5-bis-(p-chlorophenyl)-cyclohexen-3-one with hydrogen and palladium. 1-Phenyl-5-p-chlorophenyl-cyclohexanone- (3) is prepared by reaction of pchlorobenzal -acetophenone and ethyl acetoacetate, heating of the resulting 1-phenyl-3-oxo- 4 - carbethoxy - 5 - p - chlorophenyl - cyclohexene- (1) with hydrochloric acid and reduction of the resulting 1 -phenyl-3-ozo-5-p-chlorophenyl-cyclohexene-( 1) with hydrogen and nickel. Pharmaceutical compositions having antibacterial, antiparasitary, amoebicidal and antiinflammatory activity comprise, as active ingredient, a [1]benzothieno[2,3-d]pyrimidine of the first general formula above or a physiologically tolerable salt thereof, in admixture or conjunction with a pharmaceutical carrier, and may be administered enterally or parenterally.