Abstract:Abstract. Present study describes the efficient synthesis of some unsaturated 1,3-oxazine-2-amines including thirteen 4-(6-methoxy-2-naphthyl)-5,6-dihydro-6(substituted phenyl)-4 H-1,3-oxazine-2-amines by KF/Al 2 O 3 catalysed solvent-free cyclization of enones with urea under microwave irradiation. The yields of the synthesized oxazines are more than 85%. The catalytic activity of this catalyst was studied by increasing the catalyst quantity from 0.05 to 0.25g in the step-wise cyclization of chalcone and urea… Show more
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