I2-DMSO mediated dual α,β-C(sp2)–H functionalization/bicyclization of o-hydroxyphenyl enaminones to construct C2,C3-disubstituted chromone derivatives: chromeno[2,3-b]pyrrol-4(1H)-ones

An unprecedented dual α,β-C(sp 2 )–H functionalization/bicyclization strategy of o -hydroxyphenyl enaminones for the preparation of chromeno[2,3- b ]pyrrol-4(1 H )-ones has been established.