Treatment of conjugated enones having both α′- and γ -hydrogens with KN(SiMe3)2 (KHMSA) in a mixed solvent of DMF with THF at −78 °C afforded preferentially linear-conjugated dienolateanions, whic...
Efficient preparation of enol carbonates by selective O-acylation of ketone sodium enolates generated in the presence of TMEDA
作者:Laurence M. Harwood、Yoram Houminer、Ajith Manage、Jeffrey I. Seeman
DOI:10.1016/0040-4039(94)80040-5
日期:1994.10
Generatingsodiumenolates in the presence of TMEDA followed by inverse addition to chloroformate esters leads cleanly to the O-acylated materials and provides a practical means of preparing such derivatives. In the absence of TMEDA mixtures of O- and C-acylated materials are obtained.