C–F Activation of hydrofluorocarbons (HFCs) mediated by aluminum reagents
摘要:
In the presence of various aluminum reagents, the difluoromethylene group (CF2) in selected hydrofluorocarbons (HFCs) undergoes a Friedel-Crafts type reaction with aromatic compounds in satisfactory yields. (C) 2009 Elsevier Ltd. All rights reserved.
PROCESS FOR PRODUCTION OF CIS-4-FLUORO-L-PROLINE DERIVATIVES
申请人:Taisho Pharmaceutical Co. Ltd.
公开号:EP1657237A1
公开(公告)日:2006-05-17
The present invention provides a safer method for production of a cis-4-fluoro-L-proline derivative under milder conditions and in good yield to give a product of high purity on an industrial scale at low cost. Namely, the present invention provides a method for producing a cis-4-fluoro-L-proline derivative, which comprises reacting a trans-4-hydroxy-L-proline derivative of the following Formula [I]:
(wherein R1 represents a protecting group for an α-amino group, and R2 represents a protecting group for a carboxyl group) with N,N-diethyl-N-(1,1,2,3,3,3-hexafluoropropyl)amine in the presence of a hydrogen fluoride-scavenger.
PROCESS FOR FLUORINATION USING 1,1,2,2-TETRAFLUOROETHYL-N,N-DIMETHYLAMINE
申请人:JUNK Christopher P.
公开号:US20090030246A1
公开(公告)日:2009-01-29
A process for making a fluorinated product comprising contacting an alcohol with 1,1,2,2-tetrafluoroethyl-N,N-dimethylamine to produce a product mixture containing the fluorinated product and N,N-dimethyl difluoroacetamide, quenching the product mixture in water to form a first organic phase and an aqueous phase, recovering fluorinated product by separating the first organic phase from the aqueous phase, treating the aqueous phase to recover N,N-dimethyl difluoroacetamide, and converting recovered N,N-dimethyl difluoroacetamide to 1,1,2,2-tetrafluoroethyl-N,N-dimethylamine.