The reaction of corticosteroid 17α, 21-cyclic ortho esters (2) with various chloroformates (3) afforded the corresponding 17α-acyloxy-21-chloro-21-deoxy derivatives (4) in good yields. It was found that several new derivatives, 17α-acyloxy-21-chloro-11β-hydroxy-6α-methyl-1, 4-pregnadiene-3, 20-diones (4a-g), exhibited potent vasoconstrictive activities.
皮质激素17α,21-环状正酯(2)与各种
氯甲酸酯(3)反应,以良好的收率生成了相应的17α-酰氧基-21-
氯-21-去氧衍
生物(4)。研究发现,几种新的衍
生物,即17α-酰氧基-21-
氯-11β-羟基-6α-甲基-1,4-孕甾二烯-3,20-二酮(4a-g),具有强效的血管收缩活性。