Rearrangement of 4β,5β-methylenepregnanes: A simple approach to A-homopregnanes and 5β-methylpregnanes
A-homopregnanes and 5β-methylpregnanes were prepared from the easily available 3β-hydroxy-20β-acetoxy-4β,5β-methylenepregnane by cationic and radical rearrangements respectively. The A-homopregnane was formed in a single step upon spontaneous rearrangement and elimination by treatment of the cyclopr...
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| Autores principales: | , , , |
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| Publicado: |
2005
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| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14246376_v2005_n12_p154_DiChenna http://hdl.handle.net/20.500.12110/paper_14246376_v2005_n12_p154_DiChenna |
| Aporte de: |
| Sumario: | A-homopregnanes and 5β-methylpregnanes were prepared from the easily available 3β-hydroxy-20β-acetoxy-4β,5β-methylenepregnane by cationic and radical rearrangements respectively. The A-homopregnane was formed in a single step upon spontaneous rearrangement and elimination by treatment of the cyclopropyl alcohol with BF3·Et2O. The 5β-methylpregnane was obtained by cleavage of the hydrazone of the corresponding cyclopropylketone followed by rearrangement mediated by mercury(II) hydrides. ©ARKAT. |
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