Highly efficient primary amine organocatalysts for the direct asymmetric aldol reaction in brine
作者:Xiao Ma、Chao-Shan Da、Lei Yi、Ya-Ning Jia、Qi-Peng Guo、Li-Ping Che、Feng-Chun Wu、Jun-Rui Wang、Wei-Ping Li
DOI:10.1016/j.tetasy.2009.05.032
日期:2009.7
amine organocatalysts, derived from natural primary amino acids, in combination with 2,4-dinitrophenol (DNP) have proven to be efficient in the presence of brine without further addition of organic solvents. The system formed by 1f and DNP was the most efficient one; it can catalyze the direct aldol reaction with a broad range of ketones and aromatic aldehydes, giving the corresponding aldol products
由六种衍生自天然伯氨基酸的伯胺有机催化剂与2,4-二硝基苯酚(DNP)组合而成的有机催化系统已证明在盐水存在下无需进一步添加有机溶剂即可有效。由1f和DNP组成的系统是最有效的系统。它可以与广泛的酮和芳族醛催化直接的羟醛反应,以高收率提供相应的羟醛产物,具有高达近乎完美的非对映体和对映体选择性(最高99/1顺/反,对映体> 99%ee)。