N-Fluoropyridinium salts provide a new system of fluorinatingagents by which a wide range of nucleophilic substrates differing in reactivity can be fluorinated due to the varying degree of fluorinating power and also fluorinated very selectively through structural alteration. The scope of selective fluorination should be broadened considerably on the basis of the present results. The N-fluoropyridinium
Methods for synthesis of dicarbamate compounds and intermediates in the formation thereof
申请人:Mortko Henry
公开号:US20060241298A1
公开(公告)日:2006-10-26
Disclosed is a method of making 2-substituted-2-halo-1,3-propanediols via reduction of corresponding malonate compounds. Also disclosed is a method of making 2-substituted-2-halo-1,3-dicarbamate compounds (such as halo derivatives of felbamate, including fluorofelbamate) via reduction of malonate compounds, followed by carbamoylation. Reduction of the malonate compounds is carried out using an electrophilic hydride reagent.
α-Monofluoroalkanoic acids are important intermediates in the synthesis of biologically active fluorine compounds. General methods of preparation have been examined, based on the three following reagents: (a) hydrogen fluoride + N-bromoacetamide; (b) diethyl monofluoromalonate; and (c) perchlorylfluoride. The first of these is the recommended procedure for simple unsubstituted α-fluoro acids; however, the
Catalytic reductive desymmetrization of malonic esters
作者:Pengwei Xu、Zhongxing Huang
DOI:10.1038/s41557-021-00715-0
日期:2021.7
carbons with a pair of enantiotopic functional groups is a practical strategy for the synthesis of quaternary stereocentres, as it divides the tasks of enantioselection and C−C bond formation. The use of disubstituted malonic esters as the substrate of desymmetrization is particularly attractive, given their easy and modular preparation, as well as the high synthetic values of the chiral monoester products
Efficient electrophilic fluorination of β-dicarbonyl compounds with the selectfluor reagent F-TEDA-BF<sub>4</sub>{1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate)}
作者:R. Eric Banks、Nicholas J. Lawrence、Allan L. Popplewell
DOI:10.1039/c39940000343
日期:——
1,3-Dicarbonyl compounds (acyclic and cyclic 1,3-diketones, β-ketoesters, β-ketoamides) are converted efficiently to 2-monofluoro derivatives, and thence to 2,2-difluoro derivatives, with 1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate).