A short total asymmetric synthesis of (+)-exo- and ()-endo-brevicomin ((+)-exo-3 and ()-endo-3), which are components of the attracting pheromone system of several bark-beetle species belonging to the genera Dendroctonus and Dryocoetes, was accomplished via a chemoenzymatic protocol. The key step consisted of biocatalytic hydrolysis by bacterial epoxide hydrolases of cis-configured 2,3-disubstituted oxiranes bearing olefinic side chains. This reaction proceeded in an enantioconvergent fashion, by affording a single enantiomeric vic-diol from the rac-epoxide in up to 92% ee and 83% isolated yield.Key words: bacterial epoxide hydrolase, 2,3-disubstituted oxirane, enantioconvergent hydrolysis, (+)-exo-brevicomin, ()-endo-brevicomin.
一种对多种属于Dendroctonus和Dryocoetes属树皮甲虫物种的吸引信息素系统中的成分(+)-exo-和(-)-endo-brevicomin进行的短程不对称合成,通过化学酶联合协议完成。关键步骤包括细菌环氧化酶的生物催化水解,水解的是带有烯烃侧链的顺式配置2,3-二取代环氧烷。该反应以对映选择性收率高达92%的方式进行,从拉氏环氧化物中得到单对映体的双醇,隔离收率为83%。关键词:细菌环氧化酶,2,3-二取代环氧烷,对映选择性水解,(+)-exo-brevicomin,(-)-endo-brevicomin。