Substituted-4-piperidino-quinazolines of the formula:
are claimed as phosphodiesterase inhibitors and cardiac stimulants, useful in the treatment of heart failure, in which X is an alkylene group of the formula -CHR.CH2-, where R is H, CH3 or C2H5, and Y is an isothiazolidine-1,1-dioxide, tetrahydrothiazine-1,1-dioxide, 1,2,5-thiadiazolidine-1,1-dioxide, 1,2,6-thiadiazine-1,1-dioxide or tetrahydrothiadiazine-1.1-dioxide group linked to X by a ring nitrogen atom and optionally alkyl-substituted, and in which either the piperidine ring is further substituted with a hydroxy group in the 3- or 4- position orthe carbon atom of X attached to the piperidine ring is further substituted with a hydroxy group. If the piperidine ring is substituted with a hydroxy group in the 3-position then it may also be substituted in the same position with an alkyl group.
式中的取代-4-
哌啶基喹唑类:
其中X是式-CHR.
CH2-的亚烷基,其中R是H、
CH3或
C2H5,Y是
异噻唑烷-1,1-二氧化物、四氢
噻嗪-1,1-二氧化物、
1,2,5-噻二唑烷-1,1-二氧化物、1,2,6-
噻二唑烷-1,1-二氧化物或四氢
噻二唑烷-1.1-二氧化物或四氢噻二嗪-1.1-二氧化物,其中
哌啶环在3-或4-位进一步被羟基取代,或连接到
哌啶环上的X的碳原子进一步被羟基取代。如果
哌啶环在 3 位被羟基取代,那么它也可以在同一位置被烷基取代。