Thio etianic acid derivatives of the formula
wherein
X' is hydrogen, fluoro, or chloro;
X2 is hydrogen, fluoro, chloro or bromo;
X3 is =C=O Cl
may also be =C when X2 is chloro; H
R is alkyl of 1 to 6 carbon atoms, or phenyl or benzyl optionally substituted with a substituent on the phenyl ring which is alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon _ atoms or halo;
R1 is hydrogen or alkanoyl of 2 to 6 carbon atoms when R2 is hydrogen, a-methyl or β-methyl or OR1 and R2 together are 16a, 17a-isopropylidenedioxy; and the solid and broken lines between C-1 and C-2 represent a double or single bond; are useful an anti-inflammatory steroids. They can be prepared by reacting the corresponding 17β-carboxylic acid or a reactive derivative thereof with an alkali metal salt of RSH.
式中的
硫代乙酸衍
生物
式中
X'是氢、
氟或
氯
X2 是氢、
氟、
氯或
溴
X3 是 =C=O Cl
当 X2 为
氯时,也可以是 =C;H
R 是 1 至 6 个碳原子的烷基,或苯基或苄基,可选择被苯基环上的 1 至 4 个碳原子的烷基、1 至 4 个碳 _ 原子的烷氧基或卤素取代;
当 R2 为氢、a-甲基或 β-甲基时,R1 为氢或 2 至 6 个碳原子的烷酰基,或 OR1 和 R2 一起为 16a、17a-异亚丙基二氧基;C-1 和 C-2 之间的实线和断线代表双键或单键。它们可以通过相应的 17β
羧酸或其活性衍
生物与 RSH 的碱
金属盐反应来制备。