ChemInform Abstract: Unexpected Pathway of the Reaction of N-[(β-Halogeno-α-tosyl)alkyl]ureas with β-Oxoester Enolates. Synthesis of Ethyl 5-Ureido-4,5-dihydrofuran-3-carboxylates and N-Carbamoylpyrrole-3-carboxylpyrrole-3-carboxylates.

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