4,4′ and 5,5′-DiamBINAP as a hydrosoluble chiral ligand: syntheses and use in Ru(II) asymmetric biphasic catalytic hydrogenation
作者:Mikaël Berthod、Christine Saluzzo、Gerard Mignani、Marc Lemaire
DOI:10.1016/j.tetasy.2003.12.033
日期:2004.2
4′ and 5,5′-DiaminomethylBINAP were prepared in five steps from enantiomerically pure BINAP. Their synthesis involves, as key steps, the regioselective bromination of BINAP and the chemoselective efficient reduction of a dicyano, diphosphine oxide into the corresponding dicyano, diphosphine by a mixture of HSiCl3/PhSiH3. The ruthenium complexes of these new ligands were tested for the homogeneous and
4,4 '和5,5 ' -DiaminomethylBINAP是在从对映异构纯BINAP五个步骤制备。它们的合成涉及关键步骤,即BINAP的区域选择性溴化和通过HSiCl 3 / PhSiH 3的混合物将二氰基二氧化膦化学选择性有效还原为相应的二氰基二膦。测试了这些新配体的钌络合物的β-酮酸酯的均相和水/有机溶剂双相不对称加氢,导致100%的转化率,对映体过量大于97%。通过用戊烷萃取产物,催化剂可以循环使用几次。