Bi-aryl rotation in phenyl-dihydroimidazoquinoline catalysts for kinetic resolution of arylalkyl carbinols
作者:Zheng Wang、Jinjin Ye、Rui Wu、Yang-Zi Liu、John S. Fossey、Jiagao Cheng、Wei-Ping Deng
DOI:10.1039/c3cy00904a
日期:——
Chiral nucleophilic catalysts, 6-aryl-phenyl-dihydroimidazoquinolines (PIQs), were designed, synthesised and applied to the kineticresolution of arylalkyl carbinols with very high selectivity (S) factors (up to 530). Density functional theory calculations indicate that multiple noncovalent interactions play a key role in chiralrecognition between 6-aryl-PIQ catalysts and chiral secondary alcohol
Optically pure bulky (hetero)arylalkyl carbinols via kinetic resolution
作者:Bin Hu、Meng Meng、John S. Fossey、Weimin Mo、Xinquan Hu、Wei-Ping Deng
DOI:10.1039/c1cc14591f
日期:——
Planar chiral nucleophilic catalyst Fc-PIP was employed in the kineticresolution of bulky (hetero)arylalkyl carbinols delivering unreacted alcohols with extremely high enantiomeric excess (>99.0% ees) in ideal conversions ranging from 50.4-56.7%.
Arylboronic Acid-Catalyzed Racemization of Secondary and Tertiary Alcohols
作者:Gregory R. Boyce、Stefania F. Musolino、Jianing Yang、Andrew D. Smith、James E. Taylor
DOI:10.1021/acs.joc.2c01602
日期:2022.10.7
The use of 2-carboxyphenylboronic acid (5 mol %) and oxalic acid (10 mol %) with 2-butanone as a solvent for the racemization of a range of enantiomerically pure secondary and tertiaryalcohols is demonstrated. The process is postulated to proceed via reversible Brønsted acid-catalyzed C–O bond cleavage through an achiral carbocation intermediate.