Abstract
Novel montmorillonite K-10 clay supported three-component reactions of substituted salicylaldehydes, N-substituted ureas/carbamates and ammonium acetate or an amine expeditiously yield 3,4-dihydro-4-amino-2H-benz[e]-1,3-oxazin-2-ones via cycloisomerization of intermediate aldimines under solvent-free microwave irradiation in a one-pot procedure.
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