The α-hydroxylation of zirconiumallenyl enolates, obtained from β-allenic esters by deprotonation with LDA or LiN(SiMe3)2 and transmetalation with Cp2ZrCl2, with dimethyldioxirane (DMDO) selectively affords 2-hydroxy-3,4-dienoates. The oxidation proceeds usually with high yield and substrate conversion and tolerates even sensitive or unreactive substrates.
使用二甲基二氧杂
环丙烷(
DMDO)对由β-
丙二烯酯通过
LDA或LiN(SiMe3)2去质子化及与Cp2ZrCl2转移
金属化得到的
锆丙二烯烯醇酸盐进行α-羟基化反应,可选择性地生成2-羟基-3,4-二烯酸酯。该氧化反应通常具有高产率和底物转化率,甚至能容忍敏感或不活泼的底物。