Nucleophilic introduction of fluorinated alkyl groups into aldehydes and ketones using the corresponding alkyl halide with samarium(II) iodide
作者:Masato Yoshida、Daiki Suzuki、Masahiko Iyoda
DOI:10.1039/a606048j
日期:——
Fluorinated alkyl groups such as PhCF2,
C6F13, CF3CCl2 and
CF2CO2Et are nucleophilically introduced into an
aldehyde or ketone using fluorinated alkyl halides with SmI2;
the reaction proceeds effectively at room temperature to give the
corresponding alcohol. Furthermore, the synthesis of
PhCF2SiMe3,
C6F13SiMe3 and
C6F13SiMe2Pri is achieved by
reaction of the halide with SmI2 in the presence of the silyl
chloride; the resultant fluoroalkylated silyl compounds are used as
reagents for nucleophilic fluoroalkylation.
2-Chloro-3,3,3-trifluoropropene derivatives are also prepared
selectively by the reaction of CF3CCl3 with an
excess of SmI2 in the presence of an aldehyde and
PriOH.
Treatment of a variety of carbonyl compounds with ethyl bromodifluoroacetate and Et2Zn in the presence of RhCl(PPh3)(3) in CH3CN afforded Reformatsky-type products in good to excellent yields in a mild reaction condition. This is a good method to obtain a beta-hydroxy-alpha,alpha-difluoro carboxylic acid ethyl ester and especially to improve the poor reactivity of ketones. (C) 2004 Elsevier Ltd. All rights reserved.
Practically useful Reformatsky Type Reactions of Chlorodifluoroacetate and Bromodifluoroacetate Induced by Samarium(II) Diiodide
作者:Masato Yoshida、Daiki Suzuki、Masahiko Iyoda
DOI:10.1080/00397919608004565
日期:1996.7
Abstract Treatment of XCF2COOEt (X = Cl and Br) with SmI2 in THF gave efficiently β,β-difluorinated enolate equivalent, which was used for Reformatskytypereaction with aldehydes and ketones to give 2,2-difluoro-3-hydroxy ester.