abstract |
Benzopyran and other benzo fusion leukotriene B4 antagonists of the formula (I) in which A, n, R1, R2 and R3 are as defined in the text. The compounds of formula (I) in which R1 is CR4R5-COOR13 c-substituted can be prepared from the compound CF3SO3 c-substituted by reaction with a trimethylsilyl ketene acetal. |