Selective Synthesis of Benzofuro[2,3‐c]isoquinolines and 5,6‐Dihydro‐7H‐benzo[c]benzofuro[2,3‐e]azepin‐7‐ones from 4‐Diazoisoquinolin‐3‐ones and Salicylaldehydes

Abstract

AbstractA catalyst‐controlled selective synthesis of benzofuro[2,3‐c]isoquinolines and 5,6‐dihydro‐7H‐benzo[c]benzofuro[2,3‐e]azepin‐7‐ones from salicylaldehydes and 4‐diazoisoquinolin‐3‐ones has been developed. The Co(III)‐catalyzed reactions furnished benzofuro[2,3‐c]isoquinolines as major products, while the Rh(III)‐catalyzed reactions afforded 5,6‐dihydro‐7H‐benzo[c]benzofuro[2,3‐e]azepin‐7‐ones as major products.