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Synthesis of Tetrasubstituted Symmetrical Pyrazines from β-Keto γ-Amino Esters: A Mild Strategy for Self-Dimerization of Peptides

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Effective method of β-keto sulfones synthesis

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Condensation of Pyrazol-5-ones Unsubstituted in the Position 1 with β-Keto Esters. Synthesis of Pyrano[2,3-c]pyrazol-6-ones

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Condensation of N-3-substituted 5-pyrazolones with esters of β-keto acids. Synthesis of pyrano[2,3-c]pyrazol-6-ones

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