Catalytic Asymmetric Synthesis of α-Quaternary Proline Derivatives by 1,3-Dipolar Cycloaddition of α-Silylimines
作者:Jorge Hernández-Toribio、Silvia Padilla、Javier Adrio、Juan C. Carretero
DOI:10.1002/anie.201203828
日期:2012.8.27
provides straightforward access to highly enantioenriched 5‐unsubstituted α‐quaternary proline derivatives. TMS=trimethylsilyl, DTBM‐Segphos=5,5′‐bis[di(3,5‐di‐tert‐butyl‐4‐methoxyphenyl)phosphino]‐4,4′‐bi‐1,3‐benzodioxole.
去亲:在Cu的存在下α-silylimines和活化烯烃前进之间标题反应我/ DTBM-SEGPHOS催化剂体系具有优良的非对映选择性和对映选择性。该方法提供了高度对映体富集5-未取代的α-季脯氨酸衍生物直截了当的访问。TMS =三甲基甲硅烷,DTBM-SEGPHOS = 5,5'-双[二(3,5-二-叔丁基-4-甲氧基苯基)膦基] -4,4'-联-1,3-苯并二氧杂环戊。