Efficient route to highly functionalized tetrahydrofurans by stereocontrolled silicon-directed cyclization
作者:F. L. van Delft、G. A. van der Marel、J. H. van Boom
DOI:10.1002/recl.19941130608
日期:——
Cyclization of 3,4,6-tri-O-benzyl-2,5-di-O-trimethylsilyl-1-deoxy-1-phenyldiisopropylsilyl-L-glucitol in the presence of BF3·Et2O or catalytic H2SO4 proceeds stereoselectively to give predominantly the fully benzylated 2,5-anhydro-L-glucitol derivative without occurrence of the Peterson elimination.
在BF 3 ·Et 2 O或催化H 2 SO存在下3,4,6-三-O-苄基-2,5-二-O-三甲基甲硅烷基-1-脱氧-1-苯基二异丙基甲硅烷基-L-葡萄糖醇的环化图4立体选择性地进行,主要得到完全苄基化的2,5-脱水-L-葡萄糖醇衍生物,而没有发生Peterson消除。