An improved synthesis of (±)-methyl shikimate through stereoselective cis dihydroxylation of (±)-methyl 5β-hydroxycyclohexa-1,3-dienoate under prévost's reaction conditions
作者:Malcolm M Campbell、Malcolm Sainsbury、Roya Yavarzadeh
DOI:10.1016/s0040-4020(01)91255-4
日期:1984.1
A Prévost-type reaction under “wet” conditions upon the O-tbutyl- dimethylsilyl derivative of (±)-methyl 5β-hydroxycyclohexa-1,3-dienoate gives (±)-methyl 3α-acetoxy-4β-hydroxy-5β-tbutyldimethylsilyloxycyclohexene which may be readily deprotected to afford (±)-methyl Shikimate in very high yield. Less selectivity is observed in a similar reaction upon the parent alcohol and when this compound is reacted
在(湿)条件下,对(±)-甲基5β-羟基环己-1,3-二烯酸酯的叔丁基-二甲基甲硅烷基衍生物进行Prévost型反应,得到(±)-甲基3α-乙酰氧基-4β-羟基-5β-叔丁基二甲基甲硅烷基氧基环己烯可以很容易地脱保护,以很高的收率得到(±)-Shi草酸甲酯。在对母体醇的类似反应中观察到较小的选择性,并且当该化合物在干燥条件下反应时,主要产物是(±)-甲基4β,5β-环氧-3β-乙酰氧基环己酸酯。还描述了与exo和7-氧杂双环甲基[2,2,1]庚5-en-2-oate内酯的Prevost反应的分析。