申请人:Plurichemie Anstalt
公开号:US04655971A1
公开(公告)日:1987-04-07
A process for the preparation of corticosteriod esters of the formula ##STR1## in which ---- signifies that a double bond can be present; X is hydrogen, chlorine or fluorine; R.sub.1 is hydrogen, fluorine, chlorine or methyl, which may be either .alpha. or .beta.; R.sub.2 is halogen, oxo or hydroxyl; or R.sub.3 is hydrogen, .alpha.-methyl or .beta.-methyl; or R.sub.2 and X jointly form an epoxide group; R.sub.4 is an acyl group of the formula RCO, in which R is one of the following (i) an alkyl group containing 1 to 16 carbon atoms, whether straight-chained, branched or cyclic; (ii) an aralkyl group of 7 to 8 carbon atoms; (iii) a phenyl group; R.sub.5 is hydroxyl or R.sub.6 ; where R.sub.6 is hydrogen, one or two halogen atom substituents or OR.sub.7, where R.sub.7 is an acyl group of the formula R'CO in which R', which can be identical or different to R in the same molecule, is one of the following: (i) an alkyl group of 1 to 16 carbon atoms, whether straight-chained, branched or cyclic; (ii) an aralkyl group of 7 to 8 carbon atoms; or (iii) a phenyl group. which comprises esterifying a compound of the formula ##STR2## wherein X, R.sub.1, R.sub.3 and R.sub.5 are as defined above, and R.sub.8 is trihaloacetate, halogen or oxo, or jointly forms an epoxide group with X; at the 17-position only, or at the 17- and 21-positions when R.sub.5 in formula III is hydroxyl, the said esterification being carried out with the anhydride of the acid containing the group desired.
这段文字描述了一种制备皮质类固醇酯的过程,其中包括酯化化合物的步骤。