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Mechanism study of cycloaddition reaction toward the synthesis of 1,3-oxazepane-4,7-diones

AbdulKarim-TalaqMohammad,Hasnah Osman, Guan-Yeow Yeap

The one-step reaction of succinic anhydride with 3- ((alkylimino)methyl)phenol in dry benzene gave 2-(3-hydroxyphenyl)-3- alkyl-1,3-oxazepane-4,7-diones in good yields. Themechanismof reaction show that the imine gave the dipolar intermediate which undergoes the cyclization of 7-membered heterocyclic ring.