Highly efficient copper-catalyzed domino ring opening and Goldberg coupling cyclization for the synthesis of 3,4-dihydro-2H-1,4-benzoxazines.

trans-3,4-Dihydro-2H-1,4-benzoxazine moieties can be synthesized by domino aziridine ring opening with o-iodophenols followed by the copper-catalyzed Goldberg coupling cyclization (intramolecular C(aryl)-N(amide) bond formation) with good to excellent yields.