Modified coumarins

摘要

1,2,3,4-Tetrahydro-5H-benzo [c] furo [3,2-g]chromen-5-ones and 8,9,10,11-tetrahydro-7H-benzo[c] furo [2,3-f] chromen-7-ones, analogs of psoralen and allopsoralen, were synthesized from 1-hydroxy-and 3-hydroxy-7,8,9,10-tetrahydro-6H-benzo [c] chromen-6-ones.