A Practical Source of Chlorodifluoromethyl Radicals. Convergent Routes to gem-Difluoroalkenes and -dienes and (2,2-Difluoroethyl)-indoles, -azaindoles, and -naphthols
摘要:
The preparation of O-octadecyl-S-chlorodifluoromethyl xanthate from chlorodifluoroacetic acid and its use as a convenient source of chlordifluoromethyl radicals is described. This reagent may be used to access gem-difluoroalkenes and -dienes, as well as (2,2-difluoroethyl)-indolines, -indoles, and -naphthols.
Synthesis of CF<sub>3</sub>CH<sub>2</sub>-Containing Indolines by Transition-Metal-Free Aryltrifluoromethylation of Unactivated Alkenes
作者:Deqiang Liang、Qishan Dong、Penghui Xu、Ying Dong、Weili Li、Yinhai Ma
DOI:10.1021/acs.joc.8b01861
日期:2018.10.5
With an unactivated double bond as the radical acceptor, allyl amines underwent a metal-free trifluoromethylation/cyclization cascade with CF3SO2Na (Langlois’ reagent), affording CF3CH2-containing indolines and tetrahydroisoquinolines, whose practical syntheses are significant challenges. This protocol features mild conditions, low cost, and a broad substrate scope.
烯丙基胺以未活化的双键作为自由基受体,与CF 3 SO 2 Na(Langlois试剂)进行了无金属的三氟甲基化/环化级联反应,从而提供了包含CF 3 CH 2的二氢吲哚和四氢异喹啉,它们的实际合成面临重大挑战。该协议具有条件温和,成本低和基材范围广的特点。
Novel compounds comprising a thiocarbonyl-sulfanyl group, which can be used for the radical synthesis of-alpha-perfluoroalkylamines
申请人:Zard Samir
公开号:US20060122404A1
公开(公告)日:2006-06-08
The invention relates to compounds having the general formula (I), the method of preparation thereof and the use thereof in organic radical synthesis. The invention also relates to compounds having the formula (II), the method of preparation thereof and a method for preparing compounds having the formula (VIII).
A Practical Radical Based Access to Functionalised Geminal Bisphosphonates
作者:Samir Z. Zard、Fabien Gagosz
DOI:10.1055/s-2003-37108
日期:——
Xanthate derivatives of tetraalkylmethylenebisphosphonate add efficiently to various functionalised olefins to give the corresponding adducts via a radical chain reaction initiated by a small amount of lauroyl peroxide.
Synthetic equivalents of alkynyl and propargyl radicals
作者:Peter Boutillier、Samir Z. Zard
DOI:10.1039/b101751i
日期:——
Radicals derived from β-ketoesters can, depending on the
position of the unpaired electron, represent synthetic equivalents to the
high energy and elusive alkynyl radicals or to the stabilised and
relatively unreactive propargyl radicals by application of the xanthate
transfer reaction followed by nitrosative cleavage of the corresponding
isoxazolinones.