引用本文:
Mahboob Alam, M. Mushfiq. Intramolecular cyclization of steroidal semicarbazones to pyrazoles using Vilsmeier reagent[J]. Chinese Chemical Letters,
2008, 19(2): 133-136.
doi:
10.1016/j.cclet.2007.11.027
Citation: Mahboob Alam, M. Mushfiq. Intramolecular cyclization of steroidal semicarbazones to pyrazoles using Vilsmeier reagent[J]. Chinese Chemical Letters, 2008, 19(2): 133-136. doi: 10.1016/j.cclet.2007.11.027
Citation: Mahboob Alam, M. Mushfiq. Intramolecular cyclization of steroidal semicarbazones to pyrazoles using Vilsmeier reagent[J]. Chinese Chemical Letters, 2008, 19(2): 133-136. doi: 10.1016/j.cclet.2007.11.027
Intramolecular cyclization of steroidal semicarbazones to pyrazoles using Vilsmeier reagent
摘要:
The preparation of hitherto unknown steroidal heterocycles containing pyrazole fused to 6, 7-position of the steroidal nucleus is described.These heterocycles were prepared by the action of Vilsmeier reagent with steroidal semicarbazones in DMF.The slructure of the compounds has been established on the basis of their elemental analysis and spectral data.A general mechanistic scheme for these reactions is also suggested based on current and previous results.
English
Intramolecular cyclization of steroidal semicarbazones to pyrazoles using Vilsmeier reagent
Abstract:
The preparation of hitherto unknown steroidal heterocycles containing pyrazole fused to 6, 7-position of the steroidal nucleus is described.These heterocycles were prepared by the action of Vilsmeier reagent with steroidal semicarbazones in DMF.The slructure of the compounds has been established on the basis of their elemental analysis and spectral data.A general mechanistic scheme for these reactions is also suggested based on current and previous results.
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Key words:
- Steroidal semicarbazones
- / Heterocycles
- / Vilsmeier reagent
- / Pyrazoles
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