4H-benzocyclo (4,5) cyclohepta (1,2-b) thiophene-4-ones for use as intermediates in the preparation of therapeutically active 4-piperidylidene-4H-benzo (4,5) cyclohepta (1,2-b) thiophene-10 (9H) -ones and-a procedure for preparing these intermediates

摘要

1422444 10 - Substituted - benzocycloheptathiophenone derivatives SANDOZ Ltd 22 Jan 1973 [24 Jan 1972] 29214/75 Divided out of 1422443 Heading C2C Novel 10 - substituted - benzocycloheptathiophenone derivatives of the formula wherein R 1 is hydrogen, chlorine, bromine or (C 1 -C 4 ) alkoxy attached in the 6- or 7-position, R 2 is (C 1 -C 4 ) alkyl. A and B together represent a single bond or A is chlorine or bromine and B is hydrogen, are prepared by reacting a compound of the formula with a compound of the formula R 3 OH, optionally in the presence of silver nitrate, to give a compound of the invention wherein A and B together do not represent a single bond, and optionally splitting off an acid HX from such a compound in order to give a compound of the invention wherein A and B together do represent a single bond.