Asymmetric synthesis of 4-ethoxy-1-p-tolylsulfonyl-3,6-dioxabicyclo[3.1.0]hexan-2-ones
作者:Alberto Fraile、José Luis García Ruano、M. Rosario Martín、Amelia Tito
DOI:10.1016/j.tet.2009.10.106
日期:2010.1
epoxidation at the electron deficient double bond by treatment with MCPBA at room temperature to afford, in good yields, enantiomerically pure 4-ethoxy-5-alkyl-1-p-tolylsulfonyl-3,6-dioxabicyclo[3.1.0]hexan-2-ones. These epoxyfuranones are obtained along with cyclopropanefuranones by reaction of 4-ethoxy-6-p-tolylsulfinylfuro[3,4-c]pyrazolin-6-ones with MPCBA. In both cases, the formation of the sulfonyl