3,4-oxido-5,14-dihydroxybufa-20,22-dienolides - with cardioactivity

摘要

Cpds. of formula (I): (where R = Me, CH2OH or CHO) are active against cardiac insufficiency. The prefd. cpds. are 5 beta, 14 beta-dihydroxy-3 beta, 4-oxidobufa-20,22-dienolide and 5 alpha, 14 beta-dihydroxy-3 alpha, 4-oxidobufa-20,22-dienolide. Cpds. (I) are pref. prepd. by reacting the corresp. bufa-3,20-22-trienolide with peracid in an inert solvent.