Alkaloid esters

Abstract

Vasodilatory eburnamine-type alkaloid esters of the formula (I) ##STR1## and salts and quaternary derivatives thereof, wherein X.about.Y REPRESENTS A =CH=CH- or ##STR2## R represents a C.sub.1-6 alkoxycarbonyl group optionally substituted with a hydroxy group or with a halogen atom, further an alkenyloxycarbonyl, aryloxycarbonyl, aralkoxycarbonyl group or an acylated primary alcohol group, especially apovincaninic acid ethyl ester, have been prepared by various methods of esterification.

Dependencies are inferred from the claim text.