439271-80-4Relevant articles and documents
Development of chiral catalysts by asymmetric activation for highly enantioselective diethylzinc addition to imines
Zhang, Hai-Le,Liu, Hua,Cui, Xin,Mi, Ai-Qiao,Jiang, Yao-Zhong,Gong, Liu-Zhu
, p. 615 - 618 (2005)
Based on the asymmetric activation concept, a library of chiral zinc complexes in situ formed by the combination of diimines derived from chiral 1,2-diphenyl-ethanene-1,2-diamine, BINOL derivatives, and diethylzinc are evaluated in the asymmetric addition of diethylzinc to N-acylimines. In the presence of 10 mol% L3ZnA1, high enantioselectivities and yields were provided for a wide range of aromatic imines in 1,2-dichloroethane at -25 °C.
Discovery of chiral catalysts by asymmetric activation for highly enantioselective diethylzinc addition to imines: Using racemic and achiral diimines as effective activators
Liu, Hua,Zhang, Hai-Le,Wang, Shuang-Jun,Mi, Ai-Qiao,Jiang, Yao-Zhong,Gong, Liu-Zhu
, p. 2901 - 2907 (2007/10/03)
A library of chiral zinc complexes formed in situ by the combination of achiral and racemic diimines with 3,3′-di(3,5-ditrifluoromethylphenyl)- BINOL and diethylzinc were evaluated in the asymmetric addition of diethylzinc to N-acylimines. In the presence of 10 mol % of chiral ligand 4 and racemic diimine 5, high enantioselectivities of up to 97% ee and yields of up to 96% were achieved for a wide range of aromatic imines in dichloromethane at -30°C.