Access to Enantioenriched Benzylic 1,1-Silylboronate Esters by Palladium-Catalyzed Enantiotopic-Group Selective Suzuki–Miyaura Coupling of (Diborylmethyl)silanes with Aryl Iodides
作者:Junghoon Kim、Seung Hwan Cho
DOI:10.1021/acscatal.8b03979
日期:2019.1.4
This work describes the palladium-catalyzed enantiotopic-group selective Suzuki–Miyaura cross-coupling of (diborylmethyl)silanes with aryl iodides. The combination of a Pd(TFA)2 and rev-Josiphos-type ligand bearing a 3,5-bis(trifluoromethyl)phenyl as benzylic phosphine substituent in the presence of NaI as an additive and NaOMe as a base promotes the reaction to high efficiency and enantioselectivity
这项工作描述了钯催化的(二硼烷基甲基)硅烷与碘代芳烃的对映体基团选择性的Suzuki-Miyaura交叉偶联。在NaI作为添加剂和NaOMe作为碱的情况下,Pd(TFA)2和带有3,5-双(三氟甲基)苯基作为苄基膦取代基的rev -Josiphos型配体的组合可促进反应高效和对映选择性。该方法提供了从容易获得的试剂合成手性苄基1,1-甲硅烷基硼酸酯的简便方法。还展示了包括硼基立体定向C–O,C–N和C–C键形成反应在内的合成应用。