Titanium-Mediated Direct Carbon-Carbon Double Bond Formation to α-Trifluoromethyl Acids: A New Contribution to the Knoevenagel Reaction and a High-Yielding and Stereoselective Synthesis of α-Trifluoromethylacrylic Acids
作者:Yanmei Liu、Hua Lai、Bo Rong、Tie Zhou、Jia Hong、Chao Yuan、Shujing Zhao、Xiaolong Zhao、Biao Jiang、Qiang Fang
DOI:10.1002/adsc.201100339
日期:2011.11
stereoselective synthesis of α-trifluoromethyl unsaturated carboxylic acids directly from the reactions of 3,3,3-trifluoropropanoic acid (CF3CH2COOH) with various aryl aldehydes in the presence of titanium tetrachloride (TiCl4) is reported here for the first time, which is a valuable expansion for the classical Knoevenagel reaction. Because these compounds may have potential applications in organic electronics and
直接由3,3,3-三氟丙酸(CF 3 CH 2 COOH)与各种芳基醛在四氯化钛(TiCl)存在下的反应直接高产率和立体选择性地合成α-三氟甲基不饱和羧酸的有效策略4)首次在这里报道,这对于经典的Knoevenagel反应是一个有价值的扩展。由于这些化合物在有机电子领域可能具有潜在的应用,并且可以容易地转化为具有出色生物活性的相应的氟化醇和氨基酸,因此该途径对于制备含α-三氟甲基的衍生物应该是一个不错的选择。