A highly efficient TBAF-promoted intramolecular cyclization of gem-dibromoolefins for the synthesis of 2-bromobenzofurans(thiophenes)
作者:Wei Chen、Yicheng Zhang、Lei Zhang、Min Wang、Lei Wang
DOI:10.1039/c1cc13967c
日期:——
A highlyefficient tetra-(n-butyl)ammonium fluoride (TBAF)-promoted intramolecular cyclization of gem-dibromoolefins has been developed for the synthesis of 2-bromobenzofused heterocycles. The reaction provides a convenient approach to 2-bromobenzofurans(thiophenes) from the corresponding readily available gem-dibromovinyl substrates without a metal.
Dihalogenvinylphenyl-phosphorsäureester, Verfahren zu ihrer Herstellung und ihre Verwendung als Schädlingsbekämpfungsmittel
申请人:BASF Aktiengesellschaft
公开号:EP0107163B1
公开(公告)日:1986-07-30
US4576935A
申请人:——
公开号:US4576935A
公开(公告)日:1986-03-18
Cathodic reduction of hydroxycarbonyl compound trichloroacetyl esters
作者:Dolly、B Batanero、F Barba
DOI:10.1016/j.tet.2003.09.051
日期:2003.11
New coumarins and new 2-(2′,2′-dichlorovinyl) phenols have been prepared by cathodic reduction under potentiostatic conditions of trichloroacetyl esters of o-hydroxyketones and o-hydroxyaldehydes in aprotic media. Electroreductions of trichloroacetyl esters of α-hydroxy-1,4-naphthoquinone, 3-hydroxy-2-methyl-4-pyrone, methyl salicylate and benzoin have also been investigated.
Trace amount Cu (ppm)-catalyzed intramolecular cyclization of 2-(gem-dibromovinyl)phenols(thiophenols) to 2-bromobenzofurans(thiophenes)
作者:Yong Ji、Pinhua Li、Xiuli Zhang、Lei Wang
DOI:10.1039/c3ob40531a
日期:——
An intramolecular cyclization of 2-(gem-dibromovinyl)phenols(thiophenols) to give 2-bromobenzofurans(thiophenes) in the presence of a trace amount of Cu (0.0064 mol%, 25 ppm) has been developed. The reaction provides the desired products in excellent yields under fluoride-free and mild reaction conditions and with a TON (turnover number) of up to 1.5 × 104.