4-tri-O-benzyl-6-O-mesyl-α-D-glucopyranoside (13) with ‘Bu3SnCu’ afforded organotin 14, which was further converted into an open-chain unsaturated aldehyde 15 (in the presence of zinc chloride). Reaction of ‘Bu3SnCu’ with sugar aldehydes provided stannyl carbinols, while with α,β-unsaturated sugar aldehydes the 1,4-addition products are formed.
铜酸三正
丁基锡与衍生自
D-半乳糖的位阻烯丙基
溴10(E)和10(Z)反应仅导致生成S N 2产物-烯丙基三丁
锡烷基糖11(E)和11(Z)具有良好的收率和保留双键的构型。'Bu 3 SnCu'与较少空间受阻的烯丙基衍
生物5a和5b(衍生自
D-葡萄糖)反应,得到S N 2和S N 2'产物的混合物(分别为6和7)。甲基2,3,4-三-O-苄基-6-O-甲磺酰基-α-
D-吡喃葡萄糖苷的处理(13)与“ Bu 3 SnCu”制得
有机锡14,将其进一步转化为开链不饱和醛15(在
氯化锌存在下)。'Bu 3 SnCu'与糖醛的反应提供了
苯乙烯醇,而与α,β-不饱和糖醛的反应则形成了1,4-加成产物。