Novel synthesis of ynolates via the cleavage of ester dianions: α-Bromo and α,α-dibromo esters as precursors
作者:Mitsuru Shindo、Yusuke Sato、Kozo Shishido
DOI:10.1016/s0040-4020(98)00006-4
日期:1998.3
ester dianions. The key intermediates, ester dianions, were generated from α-bromocarboxylic acid ester enolates via lithium halogen exchange. α,α-Dibromocarboxylic acid ester also gives lithium amide free ynolates by addition of tert-BuLi. The reactions of ynolates, generated by this novel and convenient method, with aldehydes to give β-lactons are discussed.
A synthesis of ynolates via the cleavage of ester dianions
作者:Mitsuru Shindo
DOI:10.1016/s0040-4039(97)00924-6
日期:1997.6
A new method for ynolate synthesis via the cleavage of ester dianions has been developed. The key intermediates, ester dianions, generated from alpha-bromocarboxylic acid ester enolates via lithium-halogen exchange turned out to be so labile that they were cleaved rapidly to give ynolates. (C) 1997 Elsevier Science Ltd.