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%.
Ru-Catalyzed Asymmetric Addition of Arylboronic Acids to Aliphatic Aldehydes via P-Chiral Monophosphorous Ligands
作者:Rui Miao、Yanping Xia、Yifei Wei、Lu Ouyang、Renshi Luo
DOI:10.3390/molecules27123898
日期:——
situ was found to promote an enantioselective addition of aliphaticaldehydes with arylboronic acids, delivering the chiral alcohols in excellent yields and enantioselectivities and exhibiting a broad scope of aliphaticaldehydes and arylboronic acids. The enantioselectivities are highly dependent on the monophosphorous ligands. The utility of this asymmetric synthetic method was showcased by a large-scale
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.