Synthesis of 1-Azaxanthones and 1-Azathioxanthones by Yb(OTf)3/TfOH Co-Catalyzed Intramolecular Friedel-Crafts Reaction
作者:Weike Su、Can Jin、Jie Li
DOI:10.3987/com-10-12029
日期:——
Intramolecular Friedel-Crafts cyclization of phenoxypyridine acids (3a-3j) and phenythiopyridine acids (4a-4i) to form 1-azaxanthones (1a-1j) and 1-azathioxanthones (2a-2i), respectively, was efficiently promoted by Yb(OTf) 3 /TfOH as co-catalysts. And a number of substrates could be cyclized in moderate to good yields.