Highly diastereoselective synthesis of optically pure trifluoromethyl-substituted imidazolidine, oxazolidine and thiazolidine
作者:Honghai Zhang、Qilong Shen、Long Lu
DOI:10.1016/j.tetlet.2010.11.061
日期:2011.1
Optically pure trifluoromethylated imidazolidine, oxazolidine, and thiazolidine derivatives were synthesized through double Michael addition of chiral amino amides, amino acids, or amino alcohols to an easily available trifluoromethyl building block methyl (Z)-2-bromo-4,4,4-trifluoro-2-butenoate. These reactions occurred highly diastereo-selectively (up to 99:1) in good yields (65–96%) under mild conditions
光学纯的三氟甲基化的咪唑烷,恶唑烷和噻唑烷衍生物是通过将手性氨基酰胺,氨基酸或氨基醇的双迈克尔加成到容易获得的三氟甲基结构单元甲基(Z)-2-溴-4,4,4-三氟合成的-2-丁烯酸酯。在温和条件下,这些反应高度非对映选择性地发生(高达99:1),收率良好(65-96%)。