Abstract
Efficient synthesis of dispiro[indoline-3,4'-pyrrolidine-3',2''-naphthalene]-1'',2,3'',4''-tetraone (3) and spiro[imidazole-4,2'-naphthalene]-1',3',4'-trione derivatives 4 that derived from lawsone moiety as high reactive building block are confirmed via 1,3-dipolar cycloaddition of azomethine ylides generate in situ from benzyl amine and isatin occurred at the double bond of arylidene of lawsone upon heating and or via addition α,β-unsaturated ketone 2 with oxidizing agent hydrogen peroxide (H2O2) (30%) and guanidine.HCl in one portion.
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