Lewis Acid Catalyzed Propargylation of Arenes with O-Propargyl Trichloroacetimidates: Synthesis of 1,3-Diarylpropynes
摘要:
[GRAPHICS]The BF3 center dot OEt2-catalyzed Friedel-Crafts propargylation of aromatic compounds with O-propargyl trichloroacetimidates is highly efficient and affords 1,3-diarylpropyne derivatives in good yields.
Gold Catalysis: Alkylideneoxazolines and -oxazoles from Intramolecular Hydroamination of an Alkyne by a Trichloroacetimidate
作者:A. Stephen K. Hashmi、Matthias Rudolph、Stefan Schymura、Jorge Visus、Wolfgang Frey
DOI:10.1002/ejoc.200600572
日期:2006.11
be prevented which delivered the oxazoles after long reaction times. Up to 3333 turnovers could be reached. With gold(I) catalysts in chloroform or dichloromethane selective hydroamination to 4-methylene-4,5-dihydrooxazoles without subsequent aromatization was exclusively observed. The gold(I) catalysts also allowed chemoselective cycloisomerization of N-propargylcarboxamides to 5-methylene-4,5-dihydrooxazoles
Lewis Acid Catalyzed Propargylation of Arenes with <i>O</i>-Propargyl Trichloroacetimidates: Synthesis of 1,3-Diarylpropynes
作者:Changkun Li、Jianbo Wang
DOI:10.1021/jo0709192
日期:2007.9.1
[GRAPHICS]The BF3 center dot OEt2-catalyzed Friedel-Crafts propargylation of aromatic compounds with O-propargyl trichloroacetimidates is highly efficient and affords 1,3-diarylpropyne derivatives in good yields.