2,4,7-substituted 5-hydroxy benzopyrans and esters

Abstract

2,4,7-Substituted 5-hydroxy benzopyrans and dihydrobenzopyrans and their esters represented by the formulae ##SPC1## Wherein each R.sub.1 is loweralkyl, and R.sub.2 is hydrogen, loweralkanoyl or ##SPC2## With Y being a straight or branched chain alkylene group having from 1-8 carbon atoms; a is an integer from 1-4; b is an integer from 1-4; X is CH.sub.2, O, S, or NR.sub.5 with R.sub.5 being hydrogen or loweralkyl, with the limitation that when X is O, S, or NR.sub.5, the sum of a and b is 3 or 4 and R.sub.4 is hydrogen or loweralkyl; and R.sub.3 is ##SPC3## With Y' being a straight or branched chain alkylene group having from 1-10 carbon atoms; and each R.sub.7, R.sub.8 and R.sub.9 are the same or different members of the group consisting of hydrogen, halo, trifluoromethyl or loweralkyl and the pharmaceutically acceptable salts thereof.

Dependencies are inferred from the claim text.