从(1R,2S)-环己烷吡啶醇出发,合成了具有不同轴手性的反式环己烷骨架铱络合物,并将其应用于3-羟甲基-2H-苯并吡喃的不对称氢化中.结果表明,当以Ir-8为催化剂,二氯甲烷为溶剂,氢气压力5MPa,室温反应16h时,可以取得极好的反应活性,产物最高对映选择性可达94%.
Trans-cyclohexane-backbone iridium complexes with different axial chirality were synthesized from ( 1 R, 2 S )-2- (pyridin-2-yl) cyclohexanol, and their application in asymmetric hydrogenation of (2 H-chromen-3- yl)methanols was investigated. When the hydrogenation was carried out using 1% It-8 as the catalyst at a hydrogen pressure of 5 MPa in dichloromethane for 16 h at room temperature, excellent activities and up to 94% ee were obtained.