Studies in stereoselective [2+2]-cycloadditions with dichloroketene
作者:David I. MaGee、Tammy C. Mallais、Peter D.M. Mayo、George M. Strunz
DOI:10.1016/j.tet.2006.02.014
日期:2006.4
During the investigation of the reaction of dichloroketene with cyclic enoxy-lactones and acyclic enoxy-ester substrates it was found that only the acylic variants effectively participated in the [2+2]-cycloaddition. Although a complete understanding of the reasons for this are lacking, molecular mechanics calculations do suggest that an out of plane twist of the cabonyl group in the acyclic compounds
Asymmetric synthesis of chiral α-keto esters via Grignard addition to oxalates
作者:David I. MaGee、Tammy C. Mallais、Marijanna Eic
DOI:10.1016/j.tetasy.2003.08.013
日期:2003.10
asymmetric synthesis of chiral α-keto esters was required. These compounds can be conveniently generated in 51–84% yields via Grignard addition to either symmetrical or mixed oxalates at −40°C in tetrahydrofuran. The reaction works equally well with aliphatic or aromatic Grignardreagents.