Chiral phosphine-phosphoramidite ligands for highly enantioselective hydrogenation of N-arylimines
作者:Qing Li、Chuan-Jin Hou、Xiao-Ning Liu、De-Zhi Huang、Yan-Jun Liu、Rui-Feng Yang、Xiang-Ping Hu
DOI:10.1039/c4ra16062b
日期:——
The asymmetrichydrogenation of N-arylimines with the chiral phosphine-phosphoramidite ligand, (Sc,Sa)-PEAPhos 2b, has been developed. The results revealed that the presence of the substituents on the 3,3′-positions of the binaphthyl backbone significantly improved the enantioselectivity. The utility of this methodology was demonstrated in the synthesis of the chiral fungicide (R)-metalaxyl.
Rationally-Designed<i>S-</i>Chiral Bissulfinamides as Highly Enantioselective Organocatalysts for Reduction of Ketimines
作者:Dong Pei、Yu Zhang、Siyu Wei、Meng Wang、Jian Sun
DOI:10.1002/adsc.200700504
日期:2008.3.7
example of S-chiral organocatalysts, that are highly efficient and enantioselective in substoichometric amounts, and which use a chiral monosulfinamide group as Lewis base to activate trichlorosilane (HSiCl3) to reduce N-arylketimines. A plausible mechanism involving two molecules of the monosulfinamde catalyst for the activation of HSiCl3 prompted us to design S-chiral bissulfinamides as new catalysts
Development of spirocyclic phosphoramidite-based hybrid diphosphorus ligands for enantioselective iridium-catalyzed hydrogenation of imines
作者:Long-Fei Nan、Xiu-Shuai Chen、Hao Chen、Xin-Hu Hu、Xin-Hong Wang、Xiang-Ping Hu
DOI:10.1039/d2ob01801b
日期:——
successfully applied in the iridium-catalyzed asymmetric hydrogenation of imines. With this newly developed chiral iridium catalytic system, a wide range of imines including sterically hindered ones could be hydrogenated to give the corresponding optically active amines in high yields (up to >99%) and with excellent enantioselectivities (up to >99% ee). The utility of this hydrogenation has been demonstrated
已经开发出带有螺环亚磷酰胺支架的不对称杂化手性二磷配体,并成功应用于亚胺的铱催化不对称氢化。借助这种新开发的手性铱催化系统,包括位阻亚胺在内的多种亚胺可以被氢化,以高产率(高达 >99%)和出色的对映选择性(高达 >99% ee)生成相应的光学活性胺. 这种氢化作用的实用性已通过手性杀真菌剂 ( S )-苯霜灵的制备得到证实。