One‐Pot Divergent Synthesis of Benzoxazines and Dihydroquinolines from Morita‐Baylis‐Hillman Alcohols

Abstract Benzoxazines and hydroquinolines have been prepared by a one‐pot process via catalyst‐controlled divergent annulations of Morita‐Baylis‐Hillman (MBH) alcohols. In the presence of diazabicyclo[2.2.2]octane, MBH alcohols reacted with Boc 2 O to form MBH carbonates, followed by intramolecular annulation to give 4 H ‐benzo[ d ][1,3]oxazines. Divergently, the combination of Bu 4 NBr and NaOH enabled the formation of 1,2‐dihydroquinolines from the same starting materials.