Synthesis of Pyrrole Derivatives via Deoxygenation of 4h-1,2-Oxazines by Iron Carbonyls

The reaction of 5,6-dihydro-4H-1,2-oxazines, which are derived from α-bromooximes and enamines, with iron carbonyl complexes such as Fe3(CO)12 and (C2H5)3NH[HFe3(CO)11] gives pyrrole derivatives in high yields, accompaning deoxygenation from the oxazines. The pyrroles are also obtained by an one-pot reaction using α-bromooximes, enamines and iron carbonyls.