Synthesis of 11b-Hydroxy Erythrina Alkaloid, Erythrartine, and Its O-Acetate (Erythrascine?)
摘要:
Oxidation of an erythrinan alkaloid erysotramidine (4) with CAN in AcOH-MeCN gave, in moderate yield, the 11-beta-acetoxy derivative (5b), which was transformed into erythrartine (8). Its O-acetate (O-acetylerythrartine) was not identical with erythrascine in the H-1-nmr spectra, presenting an ambiguity on the reported structure of erythrascine.
Oxidation of an erythrinan alkaloid erysotramidine (4) with CAN in AcOH-MeCN gave, in moderate yield, the 11-beta-acetoxy derivative (5b), which was transformed into erythrartine (8). Its O-acetate (O-acetylerythrartine) was not identical with erythrascine in the H-1-nmr spectra, presenting an ambiguity on the reported structure of erythrascine.