Regioselective construction of six-membered fused heterocyclic rings via Pd/C-mediated C-C coupling followed by iodocyclization strategy: a new entry to 2H-1,2-benzothiazine-1,1-dioxides
We describe a practical and elegant method of constructing a thiazine ring fused with benzene under mild reaction conditions. A?variety of 4-iodo-2H-benzo[e][1,2]thiazine-1,1-dioxides were prepared with high regioselectivity via a two-step process involvi