An enzymatic kinetic resolution of diarylmethanols via acylation has been developed. This was achieved by the use of a mutated variant of CALB that accepts larger substrates compared to the wild type. By the use of diarylmethanols with two differently sized aryl groups, enantioselective transformations were achieved. A larger size-difference led to a higher enantioselectivity. In addition, substrates with electronically different aryl groups, such as phenyl and pyridyl, also gave an enantioselective reaction. The highest E value was observed with a substrate where steric and electronic effects were combined. (C) 2012 Elsevier Ltd. All rights reserved.
Ligand-Free Iridium-Catalyzed Dehydrogenative <i>ortho</i>
C−H Borylation of Benzyl-2-Pyridines at Room Temperature
作者:Yuhuan Yang、Qian Gao、Senmiao Xu
DOI:10.1002/adsc.201801292
日期:2019.2.19
A convenient and ligand‐free iridium‐catalyzed dehydrogenative orthoC−Hborylation of benzyl‐2‐pyridines has been developed. The reaction proceeds smoothly at room temperature using pinacolborane as a borylating reagent in the presence of catalytic amount of [IrOMe(COD)]2. The reaction is compatible with many functional groups, providing a vast array of ortho borylated products in moderate to excellent