Difluoromethylation of N-arylsulfonyl hydrazones with difluorocarbene generated fromdifluoromethylene phosphobetaine (Ph3P+CF2CO2-) to give various difluoromethyl aryl sulfones is described.
Iron-catalyzed synthesis of cyclopropanes by <i>in situ</i> generation and decomposition of electronically diversified diazo compounds
作者:Emmanuelle M. D. Allouche、Afnan Al-Saleh、André B. Charette
DOI:10.1039/c8cc07060a
日期:——
The modular synthesis of a variety of trans 1,2-disubstituted cyclopropanes in a safe and user-friendly one-pot iron-catalyzed cyclopropanation reaction is described. Easily synthesized N-nosylhydrazones are used as diazo precursors, allowing the in situ generation of electron-rich diazo compounds under mild reaction conditions and their direct participation in the cyclopropanation reaction.
Treatment of α-amino-α-arylacetonitriles with aldehyde arenesulfonyl hydrazones affords unsymmetrical α-aminoazines in high yields, which formed by replacement of the arenesulfonyl group of the hydrazone by the acetonitrile carbanion. The formation-mechanism of azines is also discussed.