Cinchona alkaloid ester derivatives as ligands in the asymmetric dihydroxylation and aminohydroxylation of alkenes
摘要:
Cinchona alkaloid ester derivatives were adopted to asymmetric dihydroxylation and asymmetric aminohydroxylation reactions in excellent yields and enantiomeric excesses.
Dinuclear salen cobalt complex incorporating Y(OTf)<sub>3</sub>: enhanced enantioselectivity in the hydrolytic kinetic resolution of epoxides
作者:Deepak Patel、Ganesh Ram Kurrey、Sandip S. Shinde、Pradeep Kumar、Geon-Joong Kim、Santosh Singh Thakur
DOI:10.1039/c5ra12408e
日期:——
activation of inactive Jacobsen’s chiralsalenCo(II) (salen = N,N′-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamine) compound is attained by dinuclear chiralsalenCo(III)–OTf complex formation with yttrium triflate. The yttrium metal not only displays a promoting effect on electron transfer, but also assists in forming two stereocentres of a Lewis acid complex with Co(III)–OTf. We found that the binuclear
Chiral Nanoporous Metal–Metallosalen Frameworks for Hydrolytic Kinetic Resolution of Epoxides
作者:Chengfeng Zhu、Guozan Yuan、Xu Chen、Zhiwei Yang、Yong Cui
DOI:10.1021/ja302340b
日期:2012.5.16
recyclable heterogeneous catalyst for hydrolytickineticresolution (HKR) of racemic epoxides with up to 99.5% ee. The MOF structure brings Co(salen) units into a highly dense arrangement and close proximity that enhances bimetallic cooperative interactions, leading to improved catalytic activity and enantioselectivity in HKR compared with its homogeneous analogues, especially at low catalyst/substrate ratios