A Convenient Synthesis of Pyrazolylpyrazoles Using α-Oxo Ketene S,S- and N,S-Acetals

A Convenient Synthesis of Pyrazolylpyrazoles Using α-Oxo Ketene S,S- and N,S-Acetals

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摘要 Substituted pyrazolylpyrazoles were synthesized through the reaction of hydrazine hydrate and α-oxo-(3, 5-dimethyl-1 H-pyrazole-1-ly)ketene S, S- and N,S-Acetals which were obtained from α-oxo-(3,5-dimethyl-1 H-pyrazole-1-yl) acetophenone. Pyrazolylpyrazole was also prepared via α-oxo ketene N,O-acetal by way of ring chain transformation. Substituted pyrazolylpyrazoles were synthesized through the reaction of hydrazine hydrate and α-oxo-(3, 5-dimethyl-1 H-pyrazole-1-ly)ketene S, S- and N,S-Acetals which were obtained from α-oxo-(3,5-dimethyl-1 H-pyrazole-1-yl) acetophenone. Pyrazolylpyrazole was also prepared via α-oxo ketene N,O-acetal by way of ring chain transformation.

作者 Han Song CHEN Zheng Ming LI Zhong Wen WANG (State Key Laboratory of Elemento-Organic Chemistry, Institute of Elemento-Organic Chemistry Nankai University, Tianjin 300071)

出处《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第8期643-646,共4页 中国化学快报（英文版）

关键词 PYRAZOLE pyrazolylpyrazole α-oxo-ketene dithioacetal ring chain transformation Pyrazole, pyrazolylpyrazole，α-oxo-ketene dithioacetal，ring chain transformation

分类号 O626 [理学—有机化学]

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Chinese Chemical Letters

1999年第8期

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A Convenient Synthesis of Pyrazolylpyrazoles Using α-Oxo Ketene S,S- and N,S-Acetals

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