Aerial oxidation of the glucocorticoid side-chain under pH control
作者:John S. Edmonds、Masatoshi Morita、Peter Turner、Brian W. Skelton、Allan H. White
DOI:10.1016/j.steroids.2005.08.003
日期:2006.1
the glyoxal is the only product; at pH values of 8 and 9.2 the etioacid is formed, and at pH values of 13 or above the epimericglycolic acids are produced. The glycolic acid epimer that predominates by a factor of 2 and is more stable has been shown by an X-ray crystal structural analysis to be the 20R compound. The presence of arsenite changes the course of the reaction and only the glycolic acids
Mechanism of base-catalyzed autooxidation of corticosteroids containing 20-keto-21-hydroxyl side chain
作者:Min Li、Bin Chen、Stephanie Monteiro、Abu M. Rustum
DOI:10.1016/j.tetlet.2009.05.074
日期:2009.8
Corticosteroids and related compounds containing the 20-keto-21-hydroxyl sidechain such as betamethasone, betamethasone 9,11-epoxide, dexamethasone, and dexamethasone 9,11-epoxide have been found to undergo facile autooxidation on the 1,3-dihydroxyacetone sidechain of their D-rings under strong alkaline conditions to yield five main degradants (17-formyloxy-17-acid, 17-acid, 21-aldehyde, 20-hydroxy-21-acid
Topical antiinflammatory activity is exhibited by steroids having the formula ##STR1## and the 1,2-dehydro and 15,16-dehydro derivatives thereof, wherein R.sub.1 is hydrogen, alkyl, carboxyl, or alkoxycarbonyl; R.sub.2 is hydrogen, chlorine, bromine, fluorine, methyl, hydroxyl or a conventional hydrolyzable ester thereof, methoxy, or oxo (.dbd.O); R.sub.3 is carbonyl or .beta.-hydroxymethylene; R.sub.4 is hydrogen or fluorine; R.sub.5 is hydrogen, methyl or fluorine; X and Y are the same or different, and each is S, O, NH, N--CH.sub.3, SO or SO.sub.2 ; and n is 1, 2, 3, 4 or 5.
Topical antiinflammatory activity is exhibited by steroids having the formula
and the 1,2-dehydro and 15,16-dehydro derivatives thereof, wherein
R1 is hydrogen, alkyl, carboxyl, oralkoxycarbonyl;
R2 is hydrogen, chlorine, bromine, fluorine, methyl, hydroxyl or a conventional hydrolyzable ester thereof, methoxy, or oxo (=O);
R3 is carbonyl or β-hydroxymethylene;
R4 is hydrogen or fluorine;
R5 is hydrogen, methyl of fluorine;
X and Y are the same or different, and each is S, O, NH, N-CH3, SO or S02; and
nis1,2,3,4or5.
具有以下式子的类固醇具有局部抗炎活性
及其 1,2-脱氢和 15,16-脱氢衍生物,其中
R1 是氢、烷基、羧基或烷氧基羰基;
R2 是氢、氯、溴、氟、甲基、羟基或其常规可水解酯、甲氧基或氧代 (=O);
R3 是羰基或 β-羟基亚甲基
R4 是氢或氟
R5 是氢、甲基或氟;
X 和 Y 相同或不同,各自为 S、O、NH、N-CH3、SO 或 S02;以及
n 是 1、2、3、4 或 5。