A new method for the synthesis of carba-sugar enones (gabosines) using a mercury(II)-mediated opening of 4,5-cyclopropanated pyranosides as the key-step
作者:Antonino Corsaro、Venerando Pistarà、Giorgio Catelani、Felicia D’Andrea、Roberto Adamo、Maria Assunta Chiacchio
DOI:10.1016/j.tetlet.2006.07.023
日期:2006.9
The stereoselective transformation of the cyclopropyl derivative 2, stereoselectively obtained with the Simmons–Smith reaction of methyl 2,6-di-O-benzyl-α-l-threo-hex-4-enopyranoside (1), into gabosines and deoxy-carbahexoses is described. The treatment of 2 with mercuric trifluoroacetate in dry methanol gives the organomercuric chloride 3, which by demercuration with lithium aluminum hydride affords
环丙基衍生物2的立体选择性转化是通过甲基2,6-二-O-苄基-α-l-苏-hex-4- enopyranoside(1)的Simmons-Smith反应立体选择性地转化为葡糖苷和脱氧氨基甲酸酯。描述。在干燥的甲醇中用三氟乙酸汞处理2,得到有机汞氯化物3,通过与氢化铝锂脱汞,得到4 C-脱氧-4-甲基-1,5-双-糖苷4。4的酸水解产生两个非对映异构体2-甲基-环己二-2-烯酮6和7的混合物,催化还原为糖10和11。所有分离的化合物的结构和立体化学均通过1D和2D NMR实验确定。