5-Phenyl-7H-furo[2,3-g]chromen-7-ones and 9-phenyl-7H-[2,3-f]chromen-7-ones, new analogs of psoralen and allopsoralen, are synthesized from 7-hydroxy- and 5-hydrozy-4-phenylcoumarins.
5-Phenyl-7H-furo[2,3-g]chromen-7-ones and 9-phenyl-7H-[2,3-f]chromen-7-ones, new analogs of psoralen and allopsoralen, are synthesized from 7-hydroxy- and 5-hydrozy-4-phenylcoumarins.