Practical synthesis of 4,4,4-trifluorocrotonaldehyde: a versatile precursor for the enantioselective formation of trifluoromethylated stereogenic centers via organocatalytic 1,4-additions
作者:Kazutaka Shibatomi、Akira Narayama、Yoshiyuki Abe、Seiji Iwasa
DOI:10.1039/c2cc32757k
日期:——
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。