Synthesis of Difluorinated Halohydrins by the Chemoselective Addition of Difluoroenolates to α-Haloketones
作者:Munia F. Sowaileh、Maali D. Alshammari、David A. Colby
DOI:10.1021/acs.orglett.1c01636
日期:2021.7.2
α-Haloketones are valuable intermediates in the synthesis of pharmaceuticals and natural products because they display two electrophiles. Although chemoselective additions to each of these functional groups are known, the use of fluorinated nucleophiles has not been characterized, except for the dimerization of fluorohalomethyl ketones. Our studies demonstrate the use of difluoroenolates to create
Apparent Electrophilic Fluorination of 1,3-Dicarbonyl Compounds Using Nucleophilic Fluoride Mediated by PhI(OAc)<sub>2</sub>
作者:Toby J. Nash、Graham Pattison
DOI:10.1002/ejoc.201500370
日期:2015.6
The apparent electrophilicfluorination of 1,3-dicarbonylcompounds using Et3N·3HF as a nucleophilic fluoride source is reported. This reaction requires PhI(OAc)2 as oxidant and can be conducted safely in standard laboratory glassware. Alternative selectivity compared to Selectfluor was observed in some cases. This approach may reduce our reliance on difficult-to-handle fluorine gas and expensive electrophilic
Cu(I)‐catalyzed three‐component reaction of 2‐iodo‐2,2‐difluoroacetophenones, alkynes, and TMSCN for the synthesis of useful difluoroacyl‐substituted nitriles is described. This method has broad substrate scope and excellent stereoselectivity. Preliminary mechanistic investigation indicated that a radical‐mediated process was involved in this cyanodifluoroalkylation reaction.
with excellent stereoselectivity. The 1‐benzoyldifluoromethyl‐2,2‐diphenylethylene products synthesized through a radical reaction process are versatile synthons for the construction of various fluorine‐containing compounds, which have antiproliferative activity on human tumor cells.
Towards Greener Fluorine Organic Chemistry: Direct Electrophilic Fluorination of Carbonyl Compounds in Water and Under Solvent-Free Reaction Conditions
作者:Gaj Stavber、Stojan Stavber
DOI:10.1002/adsc.201000477
日期:2010.11.2
Selective and efficient fluorination of organic 1,3-dicarbonyl compounds was achieved using the electrophilic fluorinating reagents SelectfluorTMF-TEDA-BF4 (1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis-tetrafluoroborate) in aqueous medium or AccufluorTMNFSi (N-fluorobenzenesulfonimide) under solvent-free reaction conditions (SFRC). Under both reaction conditions cyclic 1,3-dicarbonyl