Regioselective and Stereospecific Halosilylating Cleavage of the Oxirane System of Glycidol Derivatives as an Efficient Strategy to C2-O-Functionalized C3-Vicinal Halohydrins
作者:Stephan D. Stamatov、Jacek Stawinski
DOI:10.1002/ejoc.200800112
日期:2008.5
andstereospecific opening of the oxirane ring upon treatment with trimethylsilyl halides (TMSX, X = Cl, Br, or I) in the presence of pyridine to produce the corresponding C2-O-trimethylsilyl-3(1)-halo-sn-glycerols in high yields. Trifluoroacetylation across the trimethylsilyloxy system of such C3-synthons with trifluoroacetic anhydride (TFAA) in the presence of a halide anion (e.g. Bu4NX; X = Cl, Br, or I), followed
缩水甘油酯和醚在吡啶存在下用三甲基甲硅烷基卤化物(TMSX、X = Cl、Br 或 I)处理环氧乙烷环发生区域选择性和立体特异性打开,生成相应的 C2-O-三甲基甲硅烷基-3(1)-高产率的 halo-sn-甘油。在卤化物阴离子(例如 Bu4NX;X = Cl、Br 或 I)存在下,使用三氟乙酸酐 (TFAA) 在此类 C3 合成子的三甲基甲硅烷氧基系统上进行三氟乙酰化,然后去除三氟乙酰瞬态保护,提供近乎定量的访问到相应的邻位卤代烷醇。或者,C2-O-酰化邻位卤代醇可以以高度化学/区域特异性的方式通过三甲基甲硅烷基保护基团直接转化为短链或长链酯官能团,通过三组分试剂获得:吡啶-羧酸-TFAA。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)