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Microwave Assisted Facile Synthesis of Some Novel Mannich’s Bases of Isatoic Anhydide Derivatives
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An efficient microwave assisted protocol for the synthesis of Mannich’s bases of isatoic-anhydride derivatives 4(a-g) has been described. Treatment of isatoic anhydride (1) with formaldehyde yielded 1-hydroxymethyl-1Hbenzo[ d][1,3]oxazine-2,4-dione (2) followed by reaction with HCl afforded 1-chloromethyl-1H-benzo[d][1,3]oxazine- 2,4dione (3) which reacted smoothly with sec. amines to give mannich’s bases 4(a-g) in excellent yield.
Keywords
Microwave Assisted Organic Synthesis, Isatoic Anhydrides, Sec. Amines, Mannich Bases.
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