Chiral Brønsted-Acid-Catalyzed Enantioselective Arylation of Ethyl Trifluoroacetoacetate and Ethyl Trifluoropyruvate
作者:Jing Nie、Guang-Wu Zhang、Lian Wang、Dong-Hua Zheng、Yan Zheng、Jun-An Ma
DOI:10.1002/ejoc.200900353
日期:2009.7
Chiral phosphoric acid was found to be an effective organocatalysts for the direct enantioselective arylation of ethyl 4,4,4-trifluoroacetoacetate (ETFAA). A series of chiral trifluoromethyl-substituted tertiary alcohols were obtained in moderate to high yields with up to 78 % ee. Several desired products were obtained with excellent optical purities after a single recrystallization. This method was
发现手性磷酸是 4,4,4-三氟乙酰乙酸乙酯 (ETFAA) 直接对映选择性芳基化的有效有机催化剂。以中等至高产率获得了一系列手性三氟甲基取代的叔醇,ee 高达 78%。单次重结晶后获得了几种具有优异光学纯度的所需产物。该方法还扩展到三氟丙酮酸乙酯,这是对路易斯酸和金鸡纳生物碱催化系统的补充。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)