Electronic and Steric Tuning of an Atropisomeric Disulfoxide Ligand Motif and Its Use in the Rh(I)-Catalyzed Addition Reactions of Boronic Acids to a Wide Range of Acceptors
作者:Guang-Zhen Zhao、Daven Foster、Gellért Sipos、Pengchao Gao、Brian W. Skelton、Alexandre N. Sobolev、Reto Dorta
DOI:10.1021/acs.joc.8b01269
日期:2018.9.7
efficiently to the rhodium precursor. The performance of this disulfoxide ligand [(M,S,S)-p-Tol-6F-BIPHESO] in catalysis was tested in both 1,4- and 1,2-addition reactions of arylboronic acids. We show that addition to both cyclic and acyclic enones as well as N-tosylarylimines proceeds with high yields and high enantioselectivities to give the corresponding products. The synthesis of enantiomerically pure p-Tol-6F-BIPHESO
合成了新颖的手性二亚砜配体对,在其对映异构体骨架的(M,S,S)-和(P,S,S)-p -Tol-6F-BIPHESO的6和6'位置带有氟原子。与铑(I)前体的络合产生了μ-Cl-和μ-OH桥连的铑二聚体络合物,其中掺入了新的(M,S,S)-p -Tol-6F-BIPHESO配体,而其同级(P,S,S)-p-Tol-6F-BIPHESO没有有效地与铑前体络合。在芳基硼酸的1,4-和1,2-加成反应中测试了该二亚砜配体[(M,S,S)-p -Tol-6F-BIPHESO]在催化中的性能。我们表明,除了环状和无环烯酮以及N-甲苯磺酰基芳烃之外,还以高产率和高对映选择性进行制备,从而得到相应的产物。对映体纯的对-Tol-6F-BIPHESO的合成是直接且廉价的,再加上这些加成反应的高催化性能和广泛的底物范围,使其成为更经典的手性配体实体的非常有吸引力的替代品。