Synthesis of Cyclopropenes via
1,2-Elimination of Bromocyclopropanes Catalyzed by Crown
Ether
作者:Michael Rubin、William Sherrill、Ryan Kim
DOI:10.1055/s-0028-1088122
日期:——
synthetic protocol for the preparation of 3,3-disubstituted cyclopropenes from the corresponding bromocyclopropanes via a base-assisted 1,2-elimination has been developed. Employment of catalytic amounts of 18-crown-6 in ethereal solvents allowed for improved yields, as compared to the classical procedure employing dimethyl sulfoxide, making this protocol applicable to the synthesis of hydrophilic cyclopropenes
已经开发了一种新的合成方案,用于通过碱辅助的1,2-消除从相应的溴环丙烷制备3,3-二取代的环丙烯。与使用二甲基亚砜的经典方法相比,在醚类溶剂中催化量的18-crown-6催化剂的使用可提高收率,从而使该方案可用于亲水性环丙烯的合成。证明了该新方法在有效合成环丙烯-3-羧酰胺(一种重要的功能化3,3-二取代环丙烯)中的应用。讨论范围和限制研究。 酰胺-环丙烯-冠醚-消除-相转移催化