Catalytic and Asymmetric Process via P<sup>III</sup>/P<sup>V</sup>═O Redox Cycling: Access to (Trifluoromethyl)cyclobutenes via a Michael Addition/Wittig Olefination Reaction
作者:Charlotte Lorton、Thomas Castanheiro、Arnaud Voituriez
DOI:10.1021/jacs.9b02539
日期:2019.7.3
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)。