Kinetic Resolution of Secondary Carbinols by a Chiral<i>N</i>,<i>N</i>-4-Dimethylaminopyridine Derivative Containing a 1,1′-Binaphthyl Unit: Hydrogen Bonding Affects Catalytic Activity and Enantioselectivity
作者:Kazuki Fujii、Koichi Mitsudo、Hiroki Mandai、Seiji Suga
DOI:10.1246/bcsj.20160135
日期:2016.9.15
We developed an acylative kineticresolution of secondary carbinols using a binaphthyl-based N,N-4-dimethylaminopyridine (DMAP) derivative 1d with tert-alcohol substituents. The reaction proceeded with a wide range of carbinols with moderate to high selectivity (s) (up to s = 79.5). Kinetic studies revealed that catalyst 1d was more catalytically active than the corresponding bis-methyl ether 1d′ or
Design, Synthesis, and Evaluation of a Helicenoidal DMAP Lewis Base Catalyst
作者:Matthew R. Crittall、Henry S. Rzepa、David R. Carbery
DOI:10.1021/ol2001705
日期:2011.3.4
The design, synthesis, and study of a helical dialkylaminopyridine Lewis base catalyst is reported. Helical DMAP analogue 4 is based upon a helicenoid structure and displays good to excellent levels of selectivity (S <= 116) in the kinetic resolution of chiral secondary alcohols. Catalyst 4 displays excellent reactivity with exceptionally low loadings of 0.05 mol % effecting practical levels of selectivity in kinetic resolutions.
Catalytic enantioselective acyl transfer: the case for 4-PPY with a C-3 carboxamide peptide auxiliary based on synthesis and modelling studies
作者:Rudy E. Cozett、Gerhard A. Venter、Maheswara Rao Gokada、Roger Hunter
DOI:10.1039/c6ob01991a
日期:——
and evaluated in the kinetic resolution of a small library of chiral benzylic secondary alcohols. A key design element was the incorporation of a tryptophan residue in the peptide side chain for promoting π-stacking between peptide side chain and the pyridiniumring of the N-acyl intermediate, in which modelling was used as a structure-based guiding tool. Together, a catalyst containing a LeuTrp-N-Boc