Azacoumestans (benzofuro [3, 2-c] quinolinones) 4 have been tained by rearrangement of iodonium ylides 7, by palladiumsynthesized using the following three methods: ring closure mediated cyclodehydrohalogenation. Only the latter reaction of 3-aryl-4-hydroxy-2- quinolones 3a-e by Pd-catalyzed cy-yielded the coumestrol analog dimethoxy derivatives 4c. d, clodehydrogenation, ring closure of 3-hydroxy-3-aryl-2, 4-which have been ...
