Phosphine-Catalyzed Diastereoselective Synthesis of β-Lactones from Disubstituted Ketenes and α-Chiral Oxyaldehydes
作者:Mukulesh Mondal、Shi Chen、Nabil Othman、Kraig A. Wheeler、Nessan J. Kerrigan
DOI:10.1021/acs.joc.5b00869
日期:2015.6.5
In this article we describe a catalytic procedure for the diastereoselective synthesis of β-lactones bearing two stereogenic centers, from disubstituted ketenes and α-chiral oxyaldehydes. Tri-n-butylphosphine was found to be the optimal catalyst in terms of effecting both good yield and diastereoselectivity (dr from 3:1 to 32:1 for 8 examples) in β-lactone formation. The major isomer of the β-lactone
在本文中,我们描述了一种催化方法,用于从双取代的烯酮和α-手性乙醛中非立体选择性合成带有两个立体生成中心的β-内酯。三Ñ丁基膦被发现是在(3 DR 1 8实施例:1〜32)都实现良好的收率非对映选择性和方面的最佳催化剂在β内酯的形成。在β内酯产品的主要异构体被确定为是反非对映体,它的形成是由极性Felkin-映模型合理化。通过31 P NMR光谱的反应监测表明了烯醇盐中间体参与反应机理。(+)-peloruside A合成子的短合成证明了该方法的实用性。