monosubstituted allenes in the presence of catalytic amounts of copper(I) chloride gives 1,3,5-substituted pyrazoles under mild conditions and very short reaction times. This site- and regioselective process involves first the complexation of copper(I) on the external double bond of the allene moiety, followed by nucleophilic attack on the central carbon atom of the so-formed copper(I)-complexed allene by the
Dipolarophilic behaviour of (arylsulfonyl)allenes towards nitrilimines
作者:Gianluigi Broggini、Giorgio Molteni
DOI:10.1039/b001947j
日期:——
The dipolarophilic behaviour of 1-[2-(acetylamino)phenylsulfonyl]propa-1,2-diene 1 towards a series of nitrilimines is here described. Mechanistic possibilities for the formation of pyrazolic products 4–7 are discussed.