| 摘要 |
The novel compounds of the general formula I wherein X is -CH=CH- or S; R1 is lower alkyl, lower alkoxy or trifluoromethyl; R2 is hydrogen, lower alkyl, lower alkoxy, hydroxy or lower alkanoyloxy; R3 and R4, independently, are hydrogen, chlorine, fluorine, lower alkyl or lower alkoxy: R5 is a radical of the formula R6-(CH2)n-C?C-or R7-O-(CH2)m-C?C-, R6 and R7 are aryl or a heterocyclic radical; n is an integer from 0 to 2; m is an integer from 1 to 2 and s is an integer from 0 to 1; with the proviso that, when s is 1, R2 cannot be hydroxy, lower alkoxy or lower alkanoyloxy: that, when n is 0, R6 must be attached through a carbon to carbon bond, and that R7 is always attached through a carbon to oxygen bond, and, when at least one asymmetric centre is present, their enantiomers and racemates and pharmaceutically acceptable acid addition salts thereof exhibit activity as platelet activating factor (PAF) antagonists and are, therefore, useful in disease states characterized by excess platelet activating factor or for the prevention and treatment of cardiovascular diseases, pulmonary diseases, immunological disorders, inflammatory diseases, dermatological disorders, shocks or transplant rejections. |
