The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 10, 1981
Filed:
Apr. 03, 1979
Peter MacDonald, Arese, IT;
Prochem Establishment, Balzers, LI;
Abstract
The invention relates to 3-acetoxy-9.beta.,11.beta.,-epoxy-pregna-1,3,5-trienes and the corresponding 3,5-dienes having the general formula 1, in which on the 1,2-position a double bond may be present and in which R.sub.3 is a hydrogen or halogen atom or a hyroxy-, acyloxy-, aroyloxy or sulphonyloxygroup; R.sub.1 and/or R.sub.2 are a hydrogen atom or a hydroxy-, aroyloxy-, acyloxy- or alkylgroup containing 1-6 carbon atoms, or in which R.sub.1 and R.sub.2 form together a 16,17-isopropylidene-dioxy group, a process for the preparation of this compounds by reacting the corresponding .DELTA..sup.1,4 -3-keto-pregnadienes or .DELTA..sup.4 -3-keto-pregnenes with isopropenylacetate and a process for their direct conversion into the corresponding 6.alpha.-halogen-substituted-pregna-1,4-diene-3-ones and pregn-4-ene-3-ones with the general formula 2 by reacting them with a positive-halogen producing agent.