Chiral Organomagnesiates as Dual Reagents for Bromine-Magnesium Exchange of 2-Bromopyridine and Access to Chiral α-Substituted 2-Pyridylcarbinols
作者:Delphine Catel、Floris Chevallier、Florence Mongin、Philippe C. Gros
DOI:10.1002/ejoc.201101490
日期:2012.1
New chiral ligand containing butyl and dibutylmagnesiates have been prepared from a range of ligands and their reactivity studied. The reagents were generally efficient in promoting the clean bromine-magnesiumexchange of 2-bromopyridine at room temperature and the subsequent reaction with aldehydes to afford α-substituted2-pyridylcarbinols in good yields. (R,R)-TADDOLate proved to be the best ligand
Isolation and Characterization of a Trinuclear Cobalt Complex Containing Trigonal-Prismatic Cobalt in Secondary Alcohol Aerobic Oxidation
作者:I. Karthikeyan、S. K. Alamsetti、G. Sekar
DOI:10.1021/om500003d
日期:2014.4.14
aerobic oxidation of pyridine-based secondaryalcohols. In this complex, a cobalt ion (the one in the middle, labeled Co2) has a novel trigonal-prismatic structure coordinated with six oxygen atoms from the substrate. The molecular oxygen present in air plays a major role in enabling this transformation to be catalytic. This aerobic catalytic reaction is very selective to pyridine-based secondary alcohols
A short, scalable and environmentally benignsynthesis of 2- and 4-substitutedbenzylpiperidines has been developed. The method is based on the temperature-programmed consecutive deoxygenation and heteroaromatic ring saturation of aryl(pyridin-2-yl)- and aryl(pyridin-4-yl)methanols and aryl(pyridin-4-yl)methanones in the presence of Pd/C catalyst. The crucial roles of the temperature, the acidity and
[1,2]-Wittig Rearrangement of Aromatic Heterocycles
作者:Gregory B. Dudley、Apiwat Wangweerawong、Jingyue Yang
DOI:10.3987/com-12-12492
日期:——
Anionic rearrangement of diverse heteroaryl ethers is reported. In many cases, directed metallation followed by formal [1,2]-Wittig rearrangement provides heteroaryl carbinols in good yield.