The practical synthesis of 4,4,4-trifluorocrotonaldehyde (1) and its application to enantioselective 1,4-additions are described. The organocatalytic 1,4-addition of 1 with several nucleophiles such as heteroaromatics, alkylthiols and aldoximes afforded the corresponding products, each bearing a trifluoromethylated stereogenic center with high optical purity. A resulting product was converted into an MAO-A inhibitor, befloxatone.
报道了4,4,4-三
氟巴豆醛(1)的实际合成及其在不对称1,4-加成反应中的应用。通过有机催化剂催化的1,4-加成反应,1与多种亲核试剂如杂芳香化合物、烷
硫醇和醛
肟反应,生成了各自带有高光学纯度的三
氟甲基化手性中心的相应产物。其中一个产物被转化为MAO-A
抑制剂贝
氟沙酮。