Alkaloid esters

摘要

Vasodilatory eburnamine-type alkaloid esters of the formula (I) (I) and salts and quaternary derivatives thereof, wherein X DIFFERENCE Y REPRESENTS A =CH=CH- or R represents a C1-6 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.