中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (+)-(1R,7R)-7-(hydroxymethyl)-5-methyl-6,8-dioxabicyclo<3.2.1>octane | 83732-31-4 | C8H14O3 | 158.197 |
—— | (6R,7S)-6-hydroxy-7-methoxymethoxy-2-nonanone ethylene ketal | 128893-35-6 | C13H26O5 | 262.346 |
—— | (6S,7S)-6-hydroxy-7-methoxymethoxy-2-nonanone ethylene ketal | 128893-37-8 | C13H26O5 | 262.346 |
—— | (3S)-3-methoxymethoxy-4,8-nonanedione 8-ethylene ketal | 128893-34-5 | C13H24O5 | 260.331 |
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.