Application of Tridentate Bis(oxazoline) Ligands in Catalytic Asymmetric Nozaki–Hiyama Allylation and Crotylation: An Example of High Enantioselection with a Non-Symmetric Bis(oxazoline) Ligand
作者:Helen A. McManus、Pier Giorgio Cozzi、Patrick J. Guiry
DOI:10.1002/adsc.200505332
日期:2006.3
symmetric and non-symmetric bis(oxazoline) ligands was applied in the Nozaki–Hiyama allylation and crotylation of benzaldehyde. It was found that both the magnitude and sense of the asymmetric induction depended strongly on the nature and combination of the oxazoline substituents. For both reactions, the non-symmetric tert-butyl/benzyl-substituted ligand proved to be the optimal ligand and was applied successfully
A pineno-salen type catalyst for the enantioselective Nozaki–Hiyama–Kishi reaction
作者:Attrimuni P. Dhondge、Ajam C. Shaikh、Chinpiao Chen
DOI:10.1016/j.tetasy.2012.05.012
日期:2012.5
A new class of pineno-salen type ligands 10, 11, 17, 20, 23, and 24 has been developed. The catalyst formed from chromium(II)-10 promotes the enantioselective Nozaki-Hiyama-Kishi allylation of alkyl and aryl aldehydes using allyl bromide. Notably, the asymmetric addition of vinyl halide to benzaldehyde was achieved with 24% ee. (C) 2012 Elsevier Ltd. All rights reserved.
A chiral spirocyclic borate ligand as a catalyst for the enantioselective Nozaki–Hiyama–Kishi allylation of arylaldehydes
作者:Xin-Ren Huang、Chinpiao Chen
DOI:10.1016/j.tetasy.2010.12.008
日期:2010.12
A chiral spirocyclic borate catalyst was used in the enantioselective Nozaki-Hiyama-Kishi allylation of arylaldehydes to determine the relationship between enantioselectivity and the Hammet constant for the production of homoallyl alcohols. (C) 2010 Elsevier Ltd. All rights reserved.