A FACILE SYNTHESIS OF HOGHLY FUNCTIONALIZED UNSYMMETRICAL HETEROBIARYLS UTILIZING THE INTRAMOLECULAR ULLMANN COUPLING REACTION DIRECTED BY SALICYL ALCOHOL AS A TEMPLATE
The cyclic heterobiaryls (3) containing a thenoyl of furoyl group were synthesized in good yields by regioselective acylations of salicyl alcohol (1), followed by the intramolecular Ullmann coupling reaction of the diesters (2).The cleavage of the two est