Scandium triflate-catalyzed one-pot domino approach towards general and efficient syntheses of unsymmetrical 9-substituted xanthene derivatives
作者:Ritesh Singh、Gautam Panda
DOI:10.1039/b919666h
日期:——
A general and efficient one-pot cascade/tandem approach to synthesize unsymmetrical 9-aryl/heteroaryl xanthenes has been developed under extremely mild reaction conditions using 10 mol% Sc(OTf)3 as a catalyst. This strategy has been further extended to synthesize 9-(thioaryl) xanthenes through tandem carbon–sulfur (C–S) and carbon–carbon (C–C) bond formation. Novel C–C and C–S bond cleavage promoted