Phosphine-catalyzed synthesis of β-lactones from ketenes and chiral β-oxyaldehydes
作者:Shi Chen、Mukulesh Mondal、Matthew P. Adams、Kraig A. Wheeler、Nessan J. Kerrigan
DOI:10.1016/j.tetlet.2015.09.141
日期:2015.11
catalytic procedure for the diastereoselective synthesis of β-lactones bearing up to three stereogenic centers, from disubstituted ketenes and chiral β-oxyaldehydes. Tri-n-butylphosphine was determined to be the best catalyst with yields of up to 95% and moderate to good diastereoselectivity (dr up to 4:1) obtained in the formation of highly substituted β-lactones.
An Evans−Tishchenko−Ring-Closing Metathesis Approach to Medium-Ring Lactones
作者:Jennifer I. Aird、Alison N. Hulme、John W. White
DOI:10.1021/ol062932z
日期:2007.2.1
approach to the synthesis of medium-ring lactones is reported based on sequential Evans-Tishchenko and ring-closingmetathesis (RCM) reactions. High diastereoselectivity (>95:5) is demonstrated in the Evans-Tishchenko reaction of unsaturated aldehydes with unsaturated beta-hydroxy ketones, and conditions for the RCM cyclization of the resultant dienes have been optimized to give high yields of medium