[EN] 3-(1H-PYRAZOL-4-YL)PYRIDINE ALLOSTERIC MODULATORS OF THE M4 MUSCARINIC ACETYLCHOLINE RECEPTOR [FR] MODULATEURS ALLOSTÉRIQUES DE TYPE 3-(1H-PYRAZOL-4-YL)PYRIDINE DU RÉCEPTEUR MUSCARINIQUE M4 DE L'ACÉTYLCHOLINE
作者:Richard D. Chambers、Martin P. Greenhall、John Hutchinson
DOI:10.1016/0040-4020(95)00883-a
日期:1996.1
In acid media, 1,3-diketones and 1,3-ketoesters can be fluorinated in high yield and often with high conversion mainly to the corresponding 2-fluoro- compounds. Diesters such as diethyl malonate do not react with fluorine under the same reaction conditions. The mechanism of these reactions has been investigated and while the identity of the electrophilic fluorinating species is uncertain, we believe
Reactions of trifluoroamine oxide: a new method for selective fluorination of 1,3-diketones and β-ketoesters
作者:Om D Gupta、Jean'ne M Shreeve
DOI:10.1016/s0040-4039(03)00467-2
日期:2003.3
Fluorination of 1,3-diketones and β-ketoesters with trifluoroamine oxide in the presence of tetrabutylammonium hydroxide (TBAH) provides a one step route to mono- and difluoro-products selectively fluorinated at the α-position in good yields.
Catalysis of the reaction between fluorine and a range of 2-substituted carbonyl compounds has been investigated. Most notably, the preparation of diethyl-2-fluoromalonate has been achieved in high yield by fluorination of diethylmalonate in the presence of hydrated copper nitrate. Reactions between fluorine and carbanions derived from 2-substituted carbonyl compounds, including phosphonates, sulphones