In the present study, we report the first enantioselective and highly efficient phosphine-catalyzed process via a chemoselective in situ phosphine oxide reduction. Starting with 4,4,4-trifluorobutane-1,3-dione and dialkyl acetylenedicarboxylate substrates, highly functionalized fluorinated cyclobutenes were obtained in excellent yields and enantioselectivities. Using the same methodology, CF3-spirocyclobutene
在本研究中,我们报告了第一个通过
化学选择性原位氧化膦还原对映选择性和高效膦催化的过程。从 4,4,4-三
氟丁烷-1,3-二酮和
乙炔二
羧酸二烷基酯底物开始,以优异的产率和对映选择性获得了高度官能化的
氟化
环丁烯。使用相同的方法,还合成了
CF3-螺
环丁烯衍
生物(34 个实例,高达 95% ee)。