143329-89-9Relevant articles and documents
Hydrogenation of Carbonyl Derivatives with a Well-Defined Rhenium Precatalyst
Wei, Duo,Roisnel, Thierry,Darcel, Christophe,Clot, Eric,Sortais, Jean-Baptiste
, p. 80 - 83 (2017/01/17)
The first efficient and general rhenium-catalyzed hydrogenation of carbonyl derivatives was developed. The key to the success of the reaction was the use of a well-defined rhenium complex bearing a tridentate diphosphinoamino ligand as the catalyst (0.5 mol %) at 70 °C in the presence of H2 (30 bar). The mechanism of the reaction was investigated by DFT(PBE0-D3) calculations.
Chemoenzymatic preparation of all the stereoisomers of 2-(1-hydroxyethyl)- and 2,6-bis(1-hydroxyethyl)pyridines and their acetates
Szatzker, Gabor,Moczar, Ildiko,Kolonits, Pal,Novak, Lajos,Huszthy, Peter,Poppe, Laszlo
, p. 2483 - 2490 (2007/10/03)
Several lipases were tested for the enantiomerically selective acetylation of racemic 1-[6-(1-hydroxyethyl)-pyridin-2-yl]ethanone rac-2 to yield alcohol (S)-2 and acetate (R)-3. Acetylation of a diastereomeric mixture of racemic and meso-2,6-bis(1-hydroxy-ethyl)pyridine, rac/meso-4, with the most selective Novozym 435 lipase in vinyl acetate resulted in a mixture of enantiopure diol (S,S)-4, monoacetate (R,S)-5 and diacetate (R,R)-6. Hydrolysis of the mixture of racemic and meso-2,6-bis(1-acetoxyethyl)pyridine rac/meso-6 by the same enzyme gave the pure enantiomers of diol (R,R)-4, monoacetate (S,R)-5 and diacetate (S,S)-6. Using further chemical and enzymatic steps alcohol (R)-2, acetate (S)-3, (S,S)- and (R,R)-monoacetates (S,S)-5 and (R,R)-5, meso-4 and its acetate meso-6 were also prepared and characterized.
Synthesis of Some 2,6-Di- and 1,2,6-Trisubstituted -1,4-Dihydropyridines as Antimicrobial Agents
Attia, A.,El-Salam, O. I. Abd,Amr, A.
, p. 297 - 308 (2007/10/03)
Reduction of 2,6-diacylpyridine (1) with amalgamated zinc in hydrochloric acid (Clemmensen reduction) and with zinc in formic or acetic acid gave rise to the formation of diethanol- (2) and/diethyl- (3) pyridines. Reduction of (1), (2) and (3) with sodium borohydride afforded the corresponding 1,4 dihydro-pyridines (4),(5) and (6), respectively. Acetylation of (4) and (5) gave triketone- (7) and ketodicarbinol- (8) derivatives, respectively, which were further reduced to the tricarbinol derivative (9). Antimicrobial evaluation of compounds (1-9) showed remarkable results when compared with four known antibiotics.