Asymmetric synthesis of carbohydrates: Synthesis of 2-deoxy-D- and 2-deoxy-L-xylofuranosides from a simple achiral precursor
作者:Michael E. Jung、John M. Gardiner
DOI:10.1016/s0040-4039(00)73487-3
日期:1994.9
3, readily prepared in two steps from propargyl bromide, 1, is converted to methyl 2-deoxy-D-xylofuranoside, 13, and to the unnatural L-enantiomer, 12, in 5 steps and 50% overall yield, utilizing asymmetric dihydroxylation (AD) of alkene 7 for introduction of chirality. A similar strategy from the isomeric Z-allylic alcohol, 4, afforded the 2-deoxy-L-ribofuranoside, but in modest enantiomeric excess
从炔丙基溴1中分两步轻松制得的炔醇3分5步转化为甲基2-脱氧-D-木呋喃糖苷13和非天然L-对映体12,总产率为50%,利用烯烃7的不对称二羟基化(AD)引入手性。来自异构的Z-烯丙醇4的类似策略提供了2-脱氧-L-呋喃核糖苷,但是对映体过量。