4-(tert-Butyldimethylsilyloxy)benzylidene acetal: a novel benzylidene-type protecting group for 1,2-diols
作者:Yosuke Kaburagi、Hiroyuki Osajima、Kousei Shimada、Hidetoshi Tokuyama、Tohru Fukuyama
DOI:10.1016/j.tetlet.2004.03.065
日期:2004.5
A novel 1,2-diol-protecting group, p-silyloxybenzylidene group, has been developed. In addition to the stepwise deprotection conditions including desilylation and the subsequent acidic hydrolysis of the p-hydroxybenzylidene group in AcOH–THF–H2O, we have established the one-pot deprotection under basic conditions [K2CO3 (5 equiv), NH2OH·HCl (5 equiv), and CsF (1 equiv) in MeOH–H2O].
已经开发出一种新的1,2-二醇保护基,对甲硅烷基氧苄叉基。除了逐步脱保护的条件(包括脱甲硅烷基化以及随后在AcOH-THF-H 2 O中对羟基苯亚甲基的酸性水解)之外,我们还建立了在碱性条件下[K 2 CO 3(5当量),一锅脱保护, NH 2 OH·HCl(5当量)和CsF(1当量)的MeOH–H 2 O]溶液。