Acetic Acid Aldol Reactions in the Presence of Trimethylsilyl Trifluoromethanesulfonate
作者:C. Wade Downey、Miles W. Johnson、Daniel H. Lawrence、Alan S. Fleisher、Kathryn J. Tracy
DOI:10.1021/jo100828c
日期:2010.8.6
TMSOTf and a trialkylamine base, acetic acid undergoes aldol addition to non-enolizable aldehydes under exceptionally mild conditions. Acidic workup yields the β-hydroxy carboxylic acid. The reaction appears to proceed via a three-step, one-pot process, including in situ trimethylsilyl ester formation, bis-silyl ketene acetal formation, and TMSOTf-catalyzed Mukaiyama aldol addition. Independently synthesized
在TMSOTf和三烷基胺碱的存在下,乙酸在异常温和的条件下会发生醛醇加成到不可烯化的醛中的现象。酸性后处理产生β-羟基羧酸。该反应似乎通过三步一锅法进行,包括原位形成三甲基甲硅烷基酯,形成双甲硅烷基烯酮缩醛和TMSOTf催化的Mukaiyama醛醇缩合。独立合成的TMSOAc在相似条件下也经历了羟醛加成反应。