mCPBA-Mediated Intramolecular Oxidative Annulation of ortho-Crotyl or Cinnamyl Arylaldehydes: Synthesis of Benzofused Five‑, Six‑, and Seven-Membered Oxacycles

mCPBA-mediated intramolecular oxidative annulation of ortho-crotyl or cinnamyl arylaldehydes provides chroman, coumaran, isochroman, and tetrahydrobenzo­[c]­oxepine under different reaction conditions. This research investigates the reaction conditions for facile and efficient transformation.