Organocatalytic enantioselective Diels–Alder reaction of 4,4,4-trifluorocrotonaldehyde
作者:Kazutaka Shibatomi、Yohei Kawasaki、Seiji Iwasa
DOI:10.1016/j.jfluchem.2015.05.011
日期:2015.11
A highly enantioselective Diels–Alder reaction of 4,4,4-trifluorocrotonaldehyde and dienes was performed with a diarylprolinol silyl ether catalyst. The reaction with cyclopentadiene, 1,3-cyclohexadiene, and 2-substituted 1,3-butadienes yielded the corresponding cycloadducts bearing a trifluoromethylated chiral carbon center with up to 97% ee, whereas the reaction with furan yielded the corresponding
用二芳基脯氨醇甲硅烷基醚催化剂进行4,4,4-三氟巴豆醛和二烯的高度对映选择性狄尔斯-阿尔德反应。与环戊二烯,1,3-环己二烯和2-取代的1,3-丁二烯的反应生成相应的带有三氟甲基化手性碳中心的环加合物,其ee高达97%,而与呋喃的反应生成相应的Friedel-Crafts加合物,其中高对映选择性。