The acid-catalysed reaction of thiols with alkyl 2,3-dideoxy-glyc-2-enopyranosides or glycals
作者:Waldemar Priebe、Aleksander Zamojski
DOI:10.1016/0040-4020(80)80017-2
日期:1980.1
The acid-catalysed (HCl or SnCl4) reaction of alkyl 2,3 dideoxy-glyc-2-enopyranosides or 3,4,6-tri-O-acetyl-D-glycals with thiols leads to mixtures of alkyl 2,3-dideoxy-1-thio-glyc-2-enopyranosides and 3-S-alkyl-3-thioglycals. Under equilibrium conditions the latter are the preponderant products of the reaction. Cross experiments have confirmed the intermediacy of the allylic carbocation in the reaction
烷基2,3二脱氧-糖-2-烯吡喃糖苷或3,4,6-三-O-乙酰基-D-乙二醇与硫醇的酸催化(HCl或SnCl 4)反应生成烷基2,3-的混合物双脱氧-1-硫代葡萄糖-2-烯吡喃糖苷和3-S-烷基-3-硫代糖醛。在平衡条件下,后者是反应的主要产物。交叉实验证实了该反应中烯丙基碳正离子的中间性。已经提出了基于HSAB原理的1,2-和2,3-不饱和糖的取代反应的合理化。