The use of trans-2,3-divinyl epoxides as precursors to carbonyl ylides
作者:Whe-Narn Chou、James B. White
DOI:10.1016/0040-4039(91)80552-h
日期:1991.12
3-Divinyl epoxides have been found to be good substrates for the generation of carbonylylides in CCl4 and 145 °C. These ylides, to a limited extent, undergo isomerization to cis-2,3-divinyl epoxides, leading to the isolation of 4,5-dihydrooxepins. Of greater potential usefulness is the finding that these ylides can be efficiently trapped in an intermolecular sense by a dipolarophile, leading to dihydrofurans