An Efficient Preparation of Acetyl Isoflavone Glucoside.
作者:Toru IZUMI、Ayako NASU、Shigehiro KATAOKA、Shoichi TOKUTAKE、Akio OBATA、Koichiro TOBE
DOI:10.1248/cpb.45.1593
日期:——
Minor components of isoflavones in soybeans, 7-(6-O-acetyl-β-D-glucopyranosyl)-3-(4-hydroxyphenyl)-4H-1-benzopyran-4-one (6"-O-acetyldaidzin, 5) and 7-(6-O-acetyl-β-D-glucopyranosyl)-5-hydroxy-3-(4-hydroxyphenyl)-4H-1-benzopyran-4-one (6"-O-acetylgenistin, 6), were efficiently prepared from 6"-O-malonyldaidzin (3) or 6"-O-malonylgenistin (4) by decarboxylation in N, N-dimethylformamide at 60°C in 46% or 57% yield, respectively. This reaction may explain the increase in the amount of the acetate during toasting of soybeans.
大豆中的异黄酮的次要成分,7-(6-O-乙酰基-β-D-吡喃葡萄糖基)-3-(4-羟基苯基)-4H-1-苯并吡喃-4-酮(6"-O-乙酰基大豆苷元,5)和7-(6-O-乙酰基-β-D-吡喃葡萄糖基)-5-羟基-3-(4-羟基苯基)-4H-1-苯并吡喃-4-酮(6"-O-乙酰基大豆苷元,6),可通过在60°C下在N,N-二甲基甲酰胺中脱羧,分别从6"-O-丙二酰基大豆苷元(3)或6"-O-丙二酰基大豆苷元(4)中有效制备,产率分别为46%或57%。该反应可以解释在烘烤大豆期间乙酸酯量的增加。