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US 6,284,887 B1Granted
Process for preparing carboxamido-4-azasteroids
AssigneePharmacia & Upjohn Company
InventorsAchille Panzeri, Matteo D'Anello, Antonio Longo, Marcella Nesi
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Abstract
A process for producing a compound of formula (I): wherein the dotted lines - - - independently represent a single or double bond and R, R1, R2 and R3 are each hydrogen or an organic radical, comprises treating the corresponding 17β-carbonylimidazole intermediates with anhydrous acids in the presence of an amine and, optionally, hydrogenating the resulting compound.
Claims7
A compound of formula (IT);
- wherein
- R2 is hydrogen or a C1-C4 alkyl group optionally substituted by one or more fluorine atoms.
The compound 3-oxo-4-azaandrost-5-ene-17β-carbonylimidazole.
Dependencies are inferred from the claim text.