5-(4-Benzyloxycarbonylaminophenyl)-6-methyl-2(1H)-pyrazinone 、 氢溴酸 、 乙醇 以
溶剂黄146 为溶剂,
以to give the title compound as its hydrobromide salt (340 mg) which after digestion with hot ethanol的产率得到5-(4-Aminophenyl)-6-methyl-2(1H)-pyrazinone hydrobromide
This invention relates to 5-(phenyl)-2(1H)-pyrazinones substituted in the 4-position of the phenyl ring by an amino or acylamino group. These compounds has inotropic activity. One specific compound is 5-(4-acetamidophenyl)-2(1H)-pyrazinone.
5-(4-Amino or acylaminophenyl)-2(1H)-pyrazinones having inotropic
申请人:Smith Kline & French Laboratories Ltd.
公开号:US04556711A1
公开(公告)日:1985-12-03
This invention relates to 5-(phenyl)-2(1H)-pyrazinones substituted in the 4-position of the phenyl ring by an amino or acylamino group. These compounds have inotropic activity. One specific compound is 5-(4-acetamidophenyl)-2(1H)-pyrazinone.
Pyrazinone derivatives of the formula (I):
or a pharmaceutically acceptable salt thereof, wherein R', R2 and R3 are independently hydrogen or C1-4 alkyl, and R4 is hydrogen, a C1-6 alkoxycarbonyl group optionally substituted by amino, hydroxy, C1-4 alkoxy or carboxy (wherein the substituent is not on the carbon atom adjacent to the -CO-O moiety); or R4 is a group -CO-(NR5)n-R6 wherein n is zero or one, R6 is hydrogen, optionally substituted C1-6 alkyl, optionally substituted phenyl, or optionally substituted pyridyl, and R5 is hydrogen, C1-6 alkyl or RS and R6 form together with the nitrogen atom to which they are attached to piperidine, morpholino, piperazine or N-/C1-6)- alkylpiperazine ring; are described.
Processes for their preparation are described, involving inter alia novel phenyl pyrazinone intermediates. Their use in pharmaceutical compositions is described, as is their use as inotropic agents.
Compounds of the formula (I):
and salts thereof are described, wherein:
R1 is cyano; a group -COR5 wherein R5 is hydrogen, C1-6- alkyl or C1-6alkoxy; or R1 is a group -CONR6R7 wherein R6 and R7 are independently hydrogen, C1-6salkyl or benzyl; and R2, R3 and R4 are independently hydrogen or C1-4alkyl. Processes and intermediates for their preparation are described, as are pharmaceutical compositions containing them and their use as inotropic agents.