Reduction of carbonyl compounds using the carbonyl reductase of kluyveromyces marxianus
申请人:Korea Institute of Science and Technology
公开号:US20030139464A1
公开(公告)日:2003-07-24
A compound represented by a genera formula (Ia) or (Ib) and a stereo-selective preparation method thereof using a carbonyl reductase which is separated from
Kluyveromyces marxianus
. The compound can be prepared by reduction of substituted &bgr;-keto ester and can be used as an intermediate in preparing &bgr;-lactam group antibiotics.
1
Trifluoromethylation of enamines under acidic conditions
作者:Roman T. Gritsenko、Vitalij V. Levin、Alexander D. Dilman、Pavel A. Belyakov、Marina I. Struchkova、Vladimir A. Tartakovsky
DOI:10.1016/j.tetlet.2009.03.187
日期:2009.6
A method for the trifluoromethylation of enamines using Me3SiCF3 leading to α-CF3-substituted amines is described. The reaction is promoted by hydrofluoric acid generated from KHF2 and either trifluoroacetic or triflic acid, and involves protonation of the enamine followed by transfer of the CF3-carbanion from the silicon reagent to the cationic electrophile.
Reactions of Sulfur- and Phosphorus-Substituted Fluoroalkylating Silicon Reagents with Imines and Enamines under Acidic Conditions
作者:Mikhail D. Kosobokov、Alexander D. Dilman、Marina I. Struchkova、Pavel A. Belyakov、Jinbo Hu
DOI:10.1021/jo202669w
日期:2012.2.17
Nucleophilic fluoroalkylation reactions of imines and enamines with alpha-phenylthio, alpha-phenylsulfonyl, and alpha-diethylphosphoryl substituted fluorinated silanes have been investigated. The reactions are promoted by hydrofluoric acid generated in situ from potassium hydrodifluoride and trifluoroacetic acid. Sulfur reagents worked well with both imines and enamines, whereas phosphorus reagent efficiently coupled only with enamines.
Yoshimoto,M. et al., Chemical and pharmaceutical bulletin, 1970, vol. 18, p. 2469 - 2477
作者:Yoshimoto,M. et al.
DOI:——
日期:——
1,3-Dipolar Cycloadditions of Azidoalkylphosphonates to Enamines. Systhesis of D2-1,2,3-triazolines and Triazoles
作者:Francisco Palacios、Ana Ma Ochoa de Retana、Jaione Pagalday
DOI:10.3987/com-94-s83
日期:——
5-Amino-Delta 2-1,2,3-triazolines (3) and 1,2,3-triazoles (4) and (8) derived from aminoalkylphosphonates have been obtained in a regioselective fashion, by treating diethyl azidoalkylphosphonates (1) with enamines (2) and (6). Reaction of azidomethylphosphonate (1) with an excess of norbornadiene yields triazoline (10). This monoadduct undergoes nitrogen evolution and retro Diels-Alder reaction to give aziridine (11) and triazole (12), respectively.