Asymmetric Synthesis of <i>trans</i>-3,4-Dialkyl-γ-butyrolactones via an Acyl-Claisen and Iodolactonization Route
作者:Qun Xu、Eriks Rozners
DOI:10.1021/ol050578j
日期:2005.7.1
[reaction: see text] A new, efficient, and general asymmetric synthesis of enantiomerically pure trans-3,4-dialkyl-gamma-lactones has been developed. The key steps are (1) copper-catalyzed three-component coupling of chiral amine, aldehyde, and alkyne, (2) acyl-Claisen rearrangement, and (3) iodolactonization. The products, chiral gamma-lactones, are versatile synthetic intermediates and structural
[反应:见正文]已开发出对映体纯的反式3,4-二烷基-γ-内酯的新型,有效且一般的不对称合成方法。关键步骤是(1)手性胺,醛和炔烃的铜催化三组分偶联,(2)酰基-克莱森重排,以及(3)碘内酯化。该产品,手性γ-内酯,是天然产物和修饰核苷的多功能合成中间体和结构单元。