中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 5-((4R,5S)-5-Ethyl-2,2-dimethyl-[1,3]dioxolan-4-yl)-pentan-2-one | 136031-76-0 | C12H22O3 | 214.305 |
—— | (4R,5R)-4-ethyl-2,2-dimethyl-5-(4-oxopentyl)-1,3-dioxolane | 97039-82-2 | C12H22O3 | 214.305 |
—— | (4R,5S)-(-)-4-Ethyl-2,2-dimethyl-5-<3-(2-methyl-1,3-dithian-2-yl)propyl>-1,3-dioxolane | 149818-50-8 | C15H28O2S2 | 304.518 |
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.