Tandem Epoxidation‐Alcoholysis or Epoxidation‐Hydrolysis of Glycals Catalyzed by Titanium(IV) Isopropoxide or Venturello’s Phosphotungstate Complex
作者:Pieter Levecque、David W. Gammon、Henok Hadgu Kinfe、Pierre Jacobs、Dirk De Vos、Bert Sels
DOI:10.1002/adsc.200800079
日期:2008.7.7
Venturello’sphosphotungstatecomplex and titanium(IV) isopropoxide [Ti(O-i-Pr)4] were successfully used as catalysts for the epoxidation-alcoholysis of glycals using hydrogen peroxide [H2O2]. Reaction substrates included a range of variously protected glycals and different alcohols were used as solvents. Ti(O-i-Pr)4 was only effective in methanol as solvent, but gave methyl glycosides in high yields
Venturello的磷钨酸盐络合物和异丙醇钛(IV)[Ti(O- i- Pr)4 ]已成功用作使用过氧化氢[H 2 O 2 ]的环氧乙烷缩合醇解的催化剂。反应底物包括各种受保护的糖基,不同的醇用作溶剂。钛(O- i- Pr)4仅在甲醇作为溶剂中有效,但以高收率和高选择性得到甲基糖苷。事实证明,Ventrollo复合物是一种用途广泛且高效的催化剂。除了在醇类溶剂中进行环氧化-醇解以外,它还显示了在双相条件下的活性,以允许长链醇的糖基化,并且在苄基化的葡糖的立体选择性二羟基化中非常有效。