Reactions of ketene acetals-14 The use of simple mixed vinylketene acetals in the annulation of quinones
作者:Jacques Savard、Paul Brassard
DOI:10.1016/s0040-4020(01)91496-6
日期:1984.1
α,β- β, γ-unsaturated esters can be converted by strong base and chlorotrimethylsilane to the corresponding mixed vinylketene acetals which are shown to be particularly useful and generally applicable reagents for the regiospecific annulation of halogenoquinones. The reaction proceeds readily with a variety of substrates including benzoquinones.
Regiospecific syntheses of quinones using vinylketene acetals derived from unsaturated esters
作者:Jacques Savard、Paul Brassard
DOI:10.1016/s0040-4039(01)86747-2
日期:——
A general method of annellating quinones in high yield has been devised using mixed vinylketene acetals obtained directly from the enolate ions of unsaturated esters.
oxidoreductase from Talaromyces islandicus WF-38-12 has been identified through genome analysis. It has been shown to catalyze a regio- and stereoselective reduction of anthrols (formed in situ by the reduction of anthraquinones in the presence of Na2S2O4) to (R)-dihydroanthracenones, with high enantiomeric excess (>99%). The implications of results on the biosynthesis of deoxygenated (bis)anthraquinones and
通过基因组分析已经鉴定了来自岛形Talaromyces islandicus WF-38-12的NADPH依赖性氧化还原酶。已显示其催化对映异构和立体选择性的蒽还原反应(对映异构体过量(> 99%))(在Na 2 S 2 O 4存在下通过蒽醌还原原位形成)变为(R)-二氢蒽酮。。讨论了结果对脱氧(双)蒽醌和改性(双)蒽醌的生物合成的影响。
SAVARD, J.;BRASSARD, P., TETRAHEDRON, 1984, 40, N 18, 3455-3464