[2+2] Photodimerization of bispyridylethylenes by a controlled shift of the protonation equilibrium
作者:Shinji Yamada、Momoko Kusafuka、Mai Sugawara
DOI:10.1016/j.tetlet.2013.05.075
日期:2013.7
Irradiation of trans-4,4'-bispyridylethylene in the presence of I equiv of concd HCl produced a syn dimer with high selectivity, whereas irradiation in the presence of more than 2 equiv of concd HCl or in the absence of HCl gave a mixture of dimers and by-products with much lower selectivity. This indicated that a suitable amount of acid served as a catalyst for the [2+2] photodimerization of BPEs through cation-pi interactions between the pyridinium and pyridine rings. (C) 2013 Elsevier Ltd. All rights reserved.
Beyerman; Bontekoe, Recueil des Travaux Chimiques des Pays-Bas, 1955, vol. 74, p. 1395,1406
作者:Beyerman、Bontekoe
DOI:——
日期:——
Chemoselective control of hydrogenation among aromatic carbonyl and benzyl alcohol derivatives using Pd/C(en) catalyst
作者:Kazuyuki Hattori、Hironao Sajiki、Kosaku Hirota
DOI:10.1016/s0040-4020(01)00421-5
日期:2001.6
of aromatic ketones and aldehydes quite smoothly give the corresponding methylene compounds via the formation of the intermediary benzylalcohols in the presence of Pd/C as a catalyst. Therefore, it is extremely difficult to isolate the intermediary benzylalcohol selectively. This paper describes a mild and chemoselective hydrogenation method of an aromatic carbonyl compound to benzylalcohol using
An Efficient Chemoenzymatic Route to Biologically Active Pyridinic Amines
作者:Ramón Liz、Martín Mejuto、Francisca Rebolledo
DOI:10.1002/ejoc.202300808
日期:2023.12
have been prepared by means of a chemoenzymatic route starting from 1,2-disubstituted ethanones. Two features of the strategy need to be he highlighted: the highly enantioselective ketoreductase (KRED)-catalyzed reduction of the starting ketones, and the efficient transformation of the resulting optically active alcohols into the target primary amines.