作者:Dieter Enders、Daniel Steinbusch
DOI:10.1002/ejoc.200300412
日期:2003.11
An efficient and straightforward ten-step asymmetric synthesis of the polyketide tarchonanthuslactone (1) in good overall yield (21% starting from chloro lactone 5) and with excellent diastereomeric and enantiomeric excesses (de, ee ⩾ 96%) is described. The new synthetic route is based on the α,β-unsaturated δ-lactone building block 5, available in enantiopure form (ee > 99%) through an enzymatic procedure
描述了一种有效且直接的十步不对称合成聚酮化合物 tarchonanthuslactone (1),总体收率良好(从氯内酯 5 开始为 21%),并且具有优异的非对映体和对映体过量(de,ee ⩾ 96%)。新的合成路线基于 α,β-不饱和 δ-内酯构件 5,可通过酶促程序以对映体纯形式 (ee > 99%) 获得,并通过 Umpolung 策略将其转化为甲基酮 11。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)