First Stereoselective Total Synthesis of Naturally Occurring (6R)-6-(4-Oxopentyl)-5,6-dihydro-2H-pyran-2-one and Its (6S)-Enantiomer¹
作者:Biswanath Das、Digambar Shinde、Boddu Kanth、Malampati Srilatha
DOI:10.1055/s-0031-1289643
日期:2012.2
e, a naturally occurring α,β-unsaturated δ-lactone, and its (6S)-enantiomer have been synthesized stereoselectively starting from pentane-1,5-diol. The synthesis involves Maruoka asymmetric allylation and ring-closing metathesis as the key steps. lactones - (6R)-6-(4-oxopent-2-enyl)-5,6-dihydro-2H-pyran-2-one - (6S)-6-(4-oxopent-2-enyl)-5,6-dihydro-2H-pyran-2-one - ring-closing metathesis - stereoselective
(6 R)-6-(4-氧戊基)-5,6-二氢-2 H-吡喃-2-酮,天然存在的α,β-不饱和δ-内酯及其(6 S)-对映异构体从戊烷-1,5-二醇开始立体选择性地合成。合成涉及Maruoka不对称烯丙基化和闭环易位作为关键步骤。 内酯-(6 R)-6-(4-氧代戊-2-烯基)-5,6-二氢-2 H-吡喃-2-酮-(6 S)-6-(4-氧代戊-2-烯基) -5,6-二氢-2 H-吡喃-2-酮-闭环复分解-立体选择性合成 该系列的第52部分“天然产物的综合研究”。