Patent GB-1325354-A (GB)
Title: Imidazolidinone derivatives process for their production and preparations containing same
Inventor: SCHINDLER W
IPC: C07D233/32
Filed: 1970-08-10
Abstract: 1325354 1 - [4 - (10,11 - Dihydro - 5H- dibenzo[a,d]cyclohepten-10-yl)-1-piperazinylalkyl] - 3 - alkyl - 2 - imidazolidinones CIBAGEIGY AG 10 Aug 1970 [11 Aug 1969] 38405/70 Heading C2C Novel 1 - [4 - (10,11 - dihydro - 5H - dibenzo- [a,d]cyclohepten - 10 - yl) - 1 - piperazinylalkyl] - 3 - alkyl - 2 - imidazolidinones of the general formula wherein X is a hydrogen or chlorine atom or a methyl or methoxy group, R 1  is a C 1-4  alkyl group, R 2  is a hydrogen atom or a methyl group and n is 2 or 3, and acid addition salts thereof are prepared (a) by reaction of an N-(10,11-dihydro- 5H - dibenzo[a,d] - cyclohepten - 10 - yl)- piperazine of the general formula or an alkali metal derivative thereof with a reactive ester of a 1-hydroxyalkyl-3-alkyl-2- imidazolidinone of the general formula (b) when n is 2, by reaction of an N-(10,11- dihydro - 5H - dibenzo[a,d]cyclohepten - 10- yl) - piperazine of the second general formula above or an alkali metal derivative thereof with a 1 - alkyl - 3,3 - bis - (2 - haloethyl) - urea of the general formula wherein each Y is a halogen atom, or an alkali metal derivative thereof; and (c) by reaction of a reactive ester of a 10,11-dihydro-5H-dibenzo- [a,d]cyclohepten-10-ol of the general formula with a 1-piperazinoalkyl-3-alkyl-2-imidazolidinone of the general formula or an alkali metal derivative thereof; followed optionally by salification of the product. N-(10,11-Dihydro-5H-dibenzo [a,d] cyclohepten-10-yl) piperazines of the second general formula above are prepared by reduction of a suitable 10,11 - dihydro - 5H - dibenzo[a,d]- cyclohepten-10-one with sodium borohydride, treatment of the resulting dibenzocyclohepten- 10-ol with thionyl chloride, reaction of the 10- chlorodibenzocycloheptene so produced with 1- piperazinecarboxylic acid ethyl ester and treatment of the resulting 4-(dibenzocyclohepten-10- yl)-piperazine-1-carbozylic acid ethyl ester with ethanolic potassium hydroxide. 1-(#-Chloroalkyl) - 3 - alkyl - 2 - imidarolidinones are prepared by heating a 1-(#-chloroalkyl)-3-alkyl-3- (2 - chloroethyl) - urea or 1 - (# - chloroalkyl)- 1 - (2 - chloroethyl) - 3 - alkyl - urea, which is prepared by the action of thionyl chloride on a corresponding urea derivative in which at least one of the chlorine atoms is replaced by a hydroxy group. 1 - Piperazinoalkyl - 3 - alkyl - 2- imidazolidinones of the sixth general formula above are prepared by reaction of an appropriate 1 - alkyl - 3 - (# - chloroalkyl) - 2 - imidazolidinone with 1-piperazinecarboxylic acid ethyl ester and treatment of the resulting 1-[(4-ethoxycarbonyl - 1 - piperazinyl) - alkyl] - 3 - alkyl - 2- imidazolidinone with ethanolic potassium hydroxide. Pharmaceutical compositions having central nervous system depressant, sympathicolytic and serotonin-antagonistic activity comprise, as active ingredients, a 1-[4-(10,11-dihydro-5H- dibenzo[a,d]cyclohepten- 10 - yl) - 1 - piperazinyl - alkyl] - 3 - alkyl - 2 - imidazolidinone of the first general formula above or a pharmaceutically acceptable acid addition salt thereof, together with a pharmaceutically acceptable diluent or carrier, and may be administered orally, rectally or parenterally.