A Ni(II)-catalyzed asymmetric addition of arylboronic acids to cyclic aldimines and ketimines is reported. Our tropos phosphine-oxazoline biphenyl ligand is crucial for the high catalytic activity, which coordinates to Ni(II)...
Synthesis and Application of Hexamethyl-1,1′-spirobiindane-Based Phosphine-Oxazoline Ligands in Ni-Catalyzed Asymmetric Arylation of Cyclic Aldimines
作者:Weiye Sun、Haorui Gu、Xufeng Lin
DOI:10.1021/acs.joc.8b00422
日期:2018.4.6
increasing applications of chiral phosphine-oxazoline (PHOX) hybrid ligands in various transition-metal-catalyzed reactions, novel PHOX ligands bearing innovative backbones are highly valuable and in great demand. This study describes the development of a new type of chiral PHOX ligands based on a hexamethyl-1,1′-spirobiindane scaffold and incorporating both a phosphine and an oxazoline moiety. The
Tandem Rh-Catalyzed Oxidative C–H Olefination and Cyclization of Enantiomerically Enriched Benzo-1,3-Sulfamidates: Stereoselective Synthesis of <i>trans</i>-1,3-Disubstituted Isoindolines
作者:Raghavendra Achary、In-A Jung、Hyeon-Kyu Lee
DOI:10.1021/acs.joc.8b00204
日期:2018.4.6
A tandem process, involving Rh(III)-catalyzed oxidative C–H olefination of enantiomericallyenriched 4-aryl-benzo-1,3-sulfamidates and subsequent intramolecular aza-Michael cyclization has been developed. The reaction produces trans-benzosulfamidate-fused-1,3-disubstituted isoindolines as major products, in which the configurational integrity of the stereogenic center in the starting material is preserved
Ni(II)/tBu-SMI-PHOX catalyzed enantioselective addition of arylboronic acids to cyclic N-sulfonyl aldimines
作者:Rui Sun、Zhongxuan Qiu、Guorui Cao、Dawei Teng
DOI:10.1016/j.tet.2020.131201
日期:2020.5
addition of arylboronic acids to cyclic N-sulfonyl aldimines is envisioned to afford excellent enantioselectivities (up to 99% ee) in high yields (up to 98%). This protocol offers new opportunities for the synthesis of chiral benzosultams containing a stereogenic tertiary carbon center. The highlights of this method include mild reaction conditions, the use of cheap metal catalyst and a wide substrate scope
设想了将有效的Ni(ClO 4)2 ·6H 2 O / SMI-PHOX催化的芳基硼酸对映选择性加成到环状N-磺酰基醛亚胺中,以高产率(高达98%)提供优异的对映选择性(高达99%ee)。 。该协议为合成含有立体异构叔碳中心的手性苯并舒坦提供了新的机会。该方法的亮点包括温和的反应条件,使用廉价的金属催化剂和广泛的底物范围。