Nonenzymatic kinetic resolution of α-aryl substituted allylic alcohols catalyzed by acyl transfer catalyst Np-PIQ
作者:Shan-Shan Jiang、Bo-Qi Gu、Ming-Yu Zhu、Xingxin Yu、Wei-Ping Deng
DOI:10.1016/j.tet.2015.01.018
日期:2015.2
Chiral alpha-aryl substituted allylic alcohols are important versatile synthetic intermediates. We report here an effective nonenzymatic kinetic resolution of racemic alpha-aryl substituted allylic alcohols by introducing different aryl groups with acyl transfer catalyst Np-PIQ and propionic anhydride, providing moderate to good selectivity factors (S=12-37). (C) 2015 Elsevier Ltd. All rights reserved.
Kinetic resolutions of chiral unsaturated alcohols that cannot be resolved efficiently via enantioselective epoxidation
作者:Kevin Burgess、Lee D. Jennings
DOI:10.1021/ja00176a076
日期:1990.9
Enantioselective esterifications of unsaturated alcohols mediated by a lipase prepared from Pseudomonas sp
作者:Kevin Burgess、Lee D. Jennings
DOI:10.1021/ja00016a032
日期:1991.7
Competition experiments and measurements of enantioselectivities were used to develop a simple active-site model (Figure 1) for resolutions of beta-hydroxy-alpha-methylene carbonyl compounds III via acyl transfers mediated by lipase from Pseudomonas sp. (AK). Further experiments were used to test and refine this model with respect to resolutions of allylic, propargylic, homopropargylic, and other alcohols (Tables I-IV, respectively). The model proved extremely reliable for predicting the sense of the asymmetric induction, and the combined data collected in this paper give an indication of what structural features of the substrates can be correlated with high enantioselectivities in these resolutions. Furthermore, the results account for the conspicuous reversal of enantioselectivity previously observed in resolutions of gamma-hydroxy-alpha,beta-unsaturated esters 35. Kinetic resolutions of two substrates (allenol 14 and dienol 9) via asymmetric epoxidations were performed for comparison with the methodology presented in this paper.