作者:Sławomir Jarosz、Katarzyna Szewczyk、Anna Gaweł、Roman Luboradzki
DOI:10.1016/j.tetasy.2004.04.020
日期:2004.6
High-pressure reactions of allyltin derivatives of furanoses with sugar aldehydes affords threo-homoallylic alcohols regardless of the configuration (Z or E) across the double bond of the starting allyltin. Reaction of methyl 2,3-di-O-benzyl-5,6,7-trideoxy-7-(tri-n-butyl)stannyl-hept-5-(Z)-eno-β-d-ribofuranoside 13Z with 2,3:4,5-di-O-isopropylidene-d-arabinose 6 was highly stereoselective and afforded
呋喃糖酶的烯丙基锡衍生物与糖醛的高压反应产生了苏糖烯丙基醇,无论起始烯丙基锡的双键的构型(Z或E)如何。甲基2,3-二-O-苄基-5,6,7-三苯氧基-7-(三-正丁基)锡烷基庚基-5-(Z)-烯基-β-d-呋喃呋喃糖苷13 Z的反应2,3:4,5-二-O-异亚丙基-d-阿拉伯糖6具有高度的立体选择性,仅提供一种苏-均烯丙基醇14,而与E-有机金属13 E相同的过程以36:64的比例提供了两种苏式醇:14和15。该结果不与被广泛接受的六元(椅子)过渡状态,其预测同意苏-异构体的反应Ë -allyltin和赤为Ž -异构体; 但是,该结果可以用扭曲的六元过渡态来解释。