Novel atropisomeric aminophosphine ligands with a bridge across the 5,5′-position of biphenyl for Rh(I)-catalyzed asymmetric hydrogenation
摘要:
A new type of atropisomeric bisaminophosphine ligands 2 with a bridge across the 5,5'-position of biphenyl has been developed. The axial chirality of this type of ligands can be retained by macro-ring strain produced from 5,5'-linkage of biphenyl even without 6,6'-substituents on biphenyls. The ligand (R)-2a showed high catalytic activities and enantioselectivities (up to 95.3% ee and quantitative yields) for Rh(I)-catalyzed asymmetric hydrogenation of a variety of methyl (Z)-2-acetamido-3-arylacrylates, (C) 2008 Elsevier Ltd. All rights reserved.
Fischer, Hans; Neugebauer, Franz A.; Chandra, Harish, Journal of the Chemical Society. Perkin transactions II, 1989, p. 727 - 730
作者:Fischer, Hans、Neugebauer, Franz A.、Chandra, Harish、Symons, Martyn C. R.
DOI:——
日期:——
Synthesis of atropisomeric 5,5′-linked biphenyl bisaminophosphine ligands and their applications in asymmetric catalysis
作者:Yong Jian Zhang、Hao Wei、Wanbin Zhang
DOI:10.1016/j.tet.2008.12.056
日期:2009.2
Atropisomeric 5,5'-linked biphenyl bisaminophosphine ligands 2 has been synthesized. The axial chirality of this type of ligands can be retained by macro ring strain produced from 5,5'-linkage of biphenyl even without 6,6'-substituents on biphenyls. The Rh complex of bisaminophosphine 2a as a catalyst is effectively working in the asymmetric hydrogenation of methyl (Z)-2-acetamido-3-arylacrylates, however, for hydrogenation of arylenamide, the low enantioselectivity was observed. When the ligands applied to Pd-catalyzed allylic alkylation, it is found that ligand 2b having a longer backbone linkage is a better ligand for enantioselection in the reaction. (C) 2008 Elsevier Ltd. All rights reserved.
Behnam, Basil A.; Hall, D. Muriel, Journal of the Chemical Society. Perkin transactions I, 1980, p. 107 - 112
作者:Behnam, Basil A.、Hall, D. Muriel
DOI:——
日期:——
BEHNAM B. A.; HALL D. M., J. CHEM. SOC. PERKIN TRANS., PART 1, 1980, NO 1, 107-112