Self-assembled organic–inorganic hybrid silica with ionic liquid framework: a novel support for the catalytic enantioselective Strecker reaction of imines using Yb(OTf)3–pybox catalyst
作者:Babak Karimi、Aziz Maleki、Dawood Elhamifar、James H. Clark、Andrew J. Hunt
DOI:10.1039/c0cc01426e
日期:——
Yb(OTf)3âpybox is immobilized in a novel self-assembled ionic liquid hybrid silica and has been successfully applied as a catalyst for the asymmetric Strecker hydrocyanation of aldimines. This catalytic system can be reused for at least 6 times without any significant loss of activity and enantioselectivity.
Catalytic asymmetric Strecker hydrocyanation of imines using Yb(OTf)3–pybox catalysts
作者:Babak Karimi、Aziz Maleki
DOI:10.1039/b908854g
日期:——
We have explored the highly enantioselective Strecker hydrocyanation of a wide range of aromatic, α,β-unsaturated, heterocyclic, and aliphatic aldimines with good to excellent conversions and ees up to 98% in the presence of catalytic amounts of Yb(OTf)3âpybox complexes.
Chiral Magnesium BINOL Phosphate-Catalyzed Phosphination of Imines: Access to Enantioenriched α-Amino Phosphine Oxides
作者:Gajendrasingh K. Ingle、Yuxue Liang、Michael G. Mormino、Guilong Li、Frank R. Fronczek、Jon C. Antilla
DOI:10.1021/ol200456y
日期:2011.4.15
A new method to synthesize chiral alpha-amino phosphine oxides is reported. The reaction combines N-substituted imines and diphenylphosphine oxide and is catalyzed by a chiral magnesium phosphate salt. A wide variety of aliphatic and aromatic aldimines substituted by electron-neutral benzhydryl or dibenzocycloheptene groups were excellent substrates for the addition reaction. The dibenzocycloheptene protected imines afforded improved enantioselectivity in the resulting products. Substituted diphenylphosphine oxide nucleophiles also showed good reactivity.
Access to α-Arylglycines by Umpolung Carboxylation of Aromatic Imines with Carbon Dioxide
作者:Chun-Xiao Guo、Wen-Zhen Zhang、Hui Zhou、Ning Zhang、Xiao-Bing Lu
DOI:10.1002/chem.201604623
日期:2016.11.21
straightforward and transition‐metal‐free approach for the efficient synthesis of α‐arylglycine derivatives from aromatic imines and carbondioxide was enabled by an umpolung carboxylation reaction. Various substituted diphenylmethimines underwent the carboxylation smoothly with carbondioxide in the presence of potassium tert‐butoxide and 18‐crown‐6 to give the corresponding carboxylated products in good to high
Small Molecule as a Chiral Organocatalyst for Asymmetric Strecker Reaction
作者:S. Saravanan、Noor-ul H. Khan、Rukhsana I. Kureshy、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1021/cs400742d
日期:2013.12.6
catalytic Streckerreaction, NMR studies and kinetic investigations were carried out with different concentrations of the catalyst 6, ethylcyanoformate, and substrate. It was found that the asymmetricStreckerreaction was first-order with respect to the concentration of the catalyst, EtOCOCN, and saturation kinetics in substrate. An appropriate stereochemical model for the enantioselective Strecker reaction