The invention provides 11β-hydroxyandrosta-4-ene-3-one compounds of Formula I, or physiologically acceptable salts or solvates thereof:
wherein R
4
represents a moiety selected from a group consisting of (A), (B) and (C), with a proviso that when R
4
represents moiety (C), Z is S:
PROCESS FOR THE ESTERIFICATION OF A CARBOTHIOIC ACID
申请人:Hovione Inter AG
公开号:EP1802647B1
公开(公告)日:2010-09-29
Process for the Esterification of a Carbothioic Acid
申请人:Sobral Luis
公开号:US20070287846A1
公开(公告)日:2007-12-13
A process for preparing compounds of formula [II]
by esterification of the C-17 hydroxyl group of 6α,9α-difluoro-11α,17α-dihydroxy-16α-methyl-3-oxoandrosta-1,4-diene-17β-carbothioic acid, the compound of formula [I] comprises treating compound [I] with a slight excess of an acyl chloride of general formula R—COCl, where R represents —CH2CH3, —CH2CH2CH3 or —CH(CH3)2, in an inert solvent, in the presence of a tertiary amine.
Preferably the process is carried out using pyridine in the presence of acetone at a temperature of from 5° C. to −20° C.