[Hydroxy(tosyloxy)iodo]benzene in organic synthesis: A facile synthesis of furo[3,2-c]coumarins using-tosyloxyketones

摘要

Facile synthesis of furo[3,2-c]coumarins (2a-g) via cyclocondensation of 4-hydroxycoumarin and-tosyloxyketones (1a-g) is described. A plausible mechanism involving C-C bond formation followed by 5-exo-tet cyclization is suggested.