Symbiotic Reagent Activation: Oppenauer Oxidation of Magnesium Alkoxides by Silylglyoxylates Triggers Second-Stage Aldolization
作者:Xin Linghu、Andrew D. Satterfield、Jeffrey S. Johnson
DOI:10.1021/ja062637+
日期:2006.7.1
alkoxide and Meerwein-Ponndorf-Verley reduction of the silylglyoxylate. The reduced silylglyoxylate undergoes subsequent [1,2]-Brook rearrangement and aldol reaction with the carbonyl oxidation product. The magnesium alkoxide may be accessed via deprotonation of primary or secondary alcohols with EtMgBr, via addition of Grignard reagents to aldehydes, or via CuI-catalyzed alkylation of epoxides. For aliphatic
在环境温度下用醇镁处理甲硅烷基乙醛酸导致醇盐的共生 Oppenauer 氧化和甲硅烷基乙醛酸的 Meerwein-Ponndorf-Verley 还原。还原的甲硅烷基乙醛酸酯随后与羰基氧化产物发生 [1,2]-布鲁克重排和羟醛反应。醇镁可以通过伯醇或仲醇与 EtMgBr 的去质子化、通过将格氏试剂添加到醛中或通过 CuI 催化的环氧化物烷基化来获得。对于脂肪族伯醇盐,观察到中等水平的抗非对映选择。交叉实验表明,新生醛从镁中心的解离速度快于 [1,2]-布鲁克重排和醛醇化。