Reactions of some 2- and 4-O-triflylglycopyranosides with MeLi, t-BuOK, and pyridine
作者:Ahmed El Nemr、Tsutomu Tsuchiya
DOI:10.1016/s0008-6215(00)00291-3
日期:2001.1
Carbohydr. Res. 1997, 301, 77-87. El Nemr, A.; Tsuchiya, T. Carbohydr. Res. 1997, 303, 267-281], the reaction modes of several methyl 2- and 4-O-triflyl-D-glycopyranosides with MeLi (strong base), t-BuOK (moderately strong base), and pyridine (weak base) have been studied. This paper describes the reactions of 3-O-benzyl-4,6-O-benzylidene-2-O-triflyl-D-gluco and -mannopyranosides with MeLi to give mainly
作为我们先前对碳水化合物的二次三氟甲磺酸酯的工作的扩展[El Nemr,A .; Tsuchiya,T。四面体Lett。1995,36,7665-7668。El Nemr,A .;Tsuchiya,T .; 小林(Y.Carbohydr)。Res。1996,293,31-59。El Nemr,A .;Tsuchiya,T。碳水化合物。Res。1997,301,77-87。El Nemr,A .;Tsuchiya,T。碳水化合物。Res。1997,303,267-281],几种甲基2-和4-O-三配基-D-糖吡喃糖苷与MeLi(强碱),t-BuOK(中度强碱)和吡啶(弱碱)的反应模式为经过研究。本文介绍了3-O-苄基-4,6-O-亚苄基-2-O-三配基-D-葡萄糖和-甘露吡喃糖苷与MeLi的反应,主要通过α-消除反应生成相应的2-C-甲基衍生物,用t-BuOK通过β-消除作用或2脱屑基2-ol产生2