作者:Sabine Laschat、Yana Galeyeva、Michael Morr、Angelika Baro、Manfred Nimtz、Florenz Sasse
DOI:10.1055/s-2005-872205
日期:——
Both optically pure siphonarienal (-)-1 and siphonarienone (-)-2 are accessible from the enantiopure precursor methyl (2R,4R,6R,8R)-2,4,6,8-tetramethylundecanoate 5. The latter was converted into the corresponding methyl 2-undecenoate 9 which either provided aldehyde (-)-1 by reduction and subsequent Swern oxidation of the unsaturated alcohol 10 or gave ketone (-)-2 via Weinreb amide 11 and its conversion with EtMgBr. Alternatively, ketone 2 can be obtained from siphonarienal (-)-1 in a two-step reaction.
从对映纯前体 (2R,4R,6R,8R)-2,4,6,8-四甲基十一烯酸甲酯 5 中可以得到光学纯度很高的虹花烯醛 (-)-1 和虹花烯酮 (-)-2。后者被转化为相应的 2-undecenoate 9 甲基,通过还原和随后的不饱和醇 10 的 Swern 氧化反应得到醛 (-)-1,或者通过 Weinreb 酰胺 11 及其与 EtMgBr 的转化反应得到酮 (-)-2。