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KMID : 0043319940170040278
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Archives of Pharmacal Research
1994 Volume.17 No. 4 p.278 ~ p.280
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Synthesis of Some New 4H-(Pyrano and/or Piperidino)[3,2-d] Pyazoles and Pyrazolo[5,4-d] Thiopyrans
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Etman H.A.
El-Ahl A.S.
Metwally M.A.
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Abstract
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1,5-diketones(3) undewent cyclization to 4H-pyrano[3,2-d]pyrazoles (4a-d),4H-piperidino[3, 2-d]pyrazole (5) and pyrazolo[5,4-d]thiopyran (6) upon treatment with P/sub 2/O/sub 5/, CH/sub 3/COONH/sub 4/ and /or P/sub 2/S/sub 5/. Moreover, treatment of (4) with CH/sub 3/COONH/sub 4/ and/or P/sub 2/S/sub 5/ afforded (5) and (6). The structures of the hitherto unknown ring systems have been confirmed by analytical and spectral data.
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KEYWORD
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Synthesis, pyranopyrazoles, piperidino-pyrazoles, pyrazolothiopyrans
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