Studies on topical antiinflammatory corticosteroids. II Synthesis and vasoconstrictive activity of 11.BETA.,17.ALPHA.,21-trihydroxy-6.ALPHA.-methyl-1,4-pregnadiene-3,20-dione 17-methoxy- and (methylthio)acetates.
作者:SABURO SUGAI、TOKUJI OKAZAKI、YOSHIO KAJIWARA、TOSHIFUMI KANBARA、YASUO NAITO、.SEIICHIRO YOSHIDA、SANYA AKABOSHI、SHIRO IKEGAMI、YOSHIAKI KAMANO
DOI:10.1248/cpb.34.1607
日期:——
17-Methoxyacetate (3a) and 17-(methylthio)acetate (3b) of 11β, 17α, 21-trihydroxy-6α-methyl-1, 4-pregnadiene-3, 20-dione (6α-methylprednisolone, 1) and their 21-esters (4a and 4b) were synthesized and tested for vasoconstrictive activities. The activities of the 17-(methylthio)acetate derivatives (3b and 4b) were more potent than those of the corresponding 17-methoxyacetates (3a and 4a). The activities of 3b, 4a2, 4b1-4 and 4b5 were equivalent to that of 9α-fluoro-11β, 21-dihydroxy-16β-methyl-17α-valeroyloxy-1, 4-pregnadiene-3, 20-dione (betamethasone 17-valerate, BV). The reaction of 6α-methylprednisolone (1) with triethyl orthomethoxyacetate afforded a stereoisomeric mixture of 6α-methylprednisolone 17, 21-cyclic ortho esters (2aA and 2aB) in a ratio of 22 : 78, while the reaction of 1 with triethyl ortho(methylthio)acetate resulted in the formation of a single isomer (2bB) of the isomeric 17, 21-cyclic ortho esters (2b).
11β,17α,21-三羟基-6α-甲基-1,4-孕二烯-3,20-二酮(6α-甲基泼尼松龙,1)的17-甲氧基乙酸酯(3a)和17-(甲硫基)乙酸酯(3b)及其21合成酯(4a 和 4b)并测试其血管收缩活性。 17-(甲硫基)乙酸酯衍生物(3b和4b)的活性比相应的17-甲氧基乙酸酯(3a和4a)更有效。 3b、4a2、4b1-4和4b5的活性相当于9α-氟-11β,21-二羟基-16β-甲基-17α-戊酰氧基-1,4-孕二烯-3,20-二酮(倍他米松17-戊酸盐,BV)。 6α-甲基泼尼松龙 (1) 与原甲氧基乙酸三乙酯反应得到 6α-甲基泼尼松龙 17, 21-环原酸酯 (2aA 和 2aB) 以 22 : 78 的比例形成的立体异构混合物,而 1 与原甲硫基三乙酯反应得到)乙酸酯导致形成异构体 17, 21-环原酸酯 (2b) 的单一异构体 (2bB)。