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Sequential (3 + 2) cycloaddition and (5 + n) annulation for modular synthesis of dihydrobenzoxazines, tetrahydrobenzoxazepines and tetrahydrobenzoxazocines†
(2018-06)
A two-step method for the (3 + 2) cycloaddition of azomethine ylides followed by a double SN2 substi tution-based (5 + n) annulation is introduced for the modular synthesis of dihydrobenzoxazine, tetra hydrobenzoxazepine ...