BENZOFUSED COMPOUNDS, PHARMACEUTICAL COMPOSITION BASED ON THEREOF, METHOD OF THEIR SYNTHESIS AND A METHOD OF SYNTHESIS OF AN INTERMEDIATE COMPOUND Russian patent published in 1998 - IPC

FIELD: organic chemistry. SUBSTANCE: benzopyrane and other benzofused antagonists of leukotriene B₄ have formula (I) where R¹ means phenyl or substituted phenyl group and A, n, R² and R³ are given in description. Invention involves pharmaceutical composition based on compounds of the formula (I), method of synthesis of compounds of the formula (I) and a method of synthesis of an intermediate compound of the formula (II). EFFECT: improved method of synthesis. 12 cl, 3 tbl