The use of ultrastable Y zeolites in the Ferrier rearrangement of acetylated and benzylated glycals
作者:Pieter Levecque、David W. Gammon、Pierre Jacobs、Dirk De Vos、Bert Sels
DOI:10.1039/b921051b
日期:——
The Ferrier rearrangement of a selection of protected glycals was successfully performed using a commercially available H-USY zeolite CBV-720 as catalyst, selected after screening a range of similar catalysts. By incorporating either alcohols, thiophenol, trimethylsilyl azide or allyltrimethylsilane in the reaction it was shown that a range of O-, S-, N- and C-glycosides could be formed. With benzylated glucal and galactal in particular, use of the CBV-720 catalyst led to significantly higher yields of the 2,3-dehydroglycosides than previously reported.
使用商业可获得的H-USY沸石CBV-720作为催化剂,对一系列保护性甘露糖环进行Ferrier重排反应,该催化剂是在筛选了一系列类似的催化剂后选出的。通过在反应中加入醇、硫酚、三甲基甲硅烷基叠氮化物或烯丙基三甲基硅烷,证明了可以形成一系列O-、S-、N-和C-糖苷。特别是对于苄基化的葡萄糖醇和半乳糖醇,使用CBV-720催化剂可以获得比先前报道的2,3-脱氢糖苷的产量明显更高的产率。