Abstract
A green and efficient procedure for the preparation of valuable 2,3-dihydrofurans and benzoxazines has been achieved through halocyclization of olefinic 1,3-dicarbonyls or olefinic amides. This protocol could be conducted under catalyst-, base-, and oxidant-free conditions in aqueous media open to the air at room temperature with good to excellent yields. Notably, the practicality of this method is further highlighted by gram-scale reactions in good yields.
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