Lipase-mediated resolution of the hydroxy-cyclogeraniol isomers: application to the synthesis of the enantiomers of karahana lactone, karahana ether, crocusatin C and γ-cyclogeraniol
作者:Stefano Serra、Francesco G. Gatti、Claudio Fuganti
DOI:10.1016/j.tetasy.2009.05.013
日期:2009.6
study on the lipase PS-mediated resolution of different hydroxy-geraniol isomers is reported. A number of α-, β- and γ-isomers bearing a 2-, 3- or 4-hydroxy functional group were synthesised regioselectively and then submitted to the lipase-mediated kinetic acetylation. The latter experiments showed that the 2-hydroxy isomers 4, 5 and 14 (α, γ and β, respectively) as well as cis-3-hydroxy α-cyclogeraniol
报道了对脂肪酶PS介导的不同羟基香叶醇异构体拆分的综合研究。选择性地合成许多带有2-,3-或4-羟基官能团的α-,β-和γ-异构体,然后进行脂肪酶介导的动力学乙酰化。后者实验表明,2-羟基异构体4,5和14(α,γ分别和β),以及顺式-3-羟基α-cyclogeraniol 7和顺式-4-羟基γ-cyclogeraniol 10可以很容易地通过此过程解决。这些化合物主要部分的对映体纯度通过重结晶而提高,所得对映体二醇被用作合成天然萜类化合物卡拉汉内酯,卡拉汉醚和番红花素C的组成部分,并用于制备合成中间体γ-环香叶醇。二醇的对映异构体的绝对构型7,10,14和19通过用已知化合物的化学相关性来确定40,41,39和41分别。