4-Halo-pregn-4-enee of the formula:
wherein
X' is fluoro or chloro;
X2 is hydrogen, fluoro or chloro;
X3 is hydrogen, fluoro, chloro or bromo;
X4 is =C=O or
or may be
when X3 is chloro;
R' is hydrogen, fluoro, chloro, bromo, hydroxy or methoxy;
R2 is fluoro, chloro, hydroxy or alkanoyloxy of 2 to 6
carbon atoms when R' is hydrogen or R2 is the same as R1
when R' is fluoro, chloro, hydroxy or methoxy;
R3 is hydroxy or alkanoyloxy of 2 to 6 carbon atoms when R4 is a-methyl or β-methyl or R3 and R4 together are
and
the solid and broken lines between the 1- and 2-positions in the A ring of the steroid nucleus represents a single or a double bond; have topical anti-inflammatory activity in mammals. They can be prepared by contacting the corresponding A5 compound with a base. The 17a-alkanoyloxy compound can be prepared by esterifying the corresponding 17a-hydroxy compound.
式中的 4-卤代-4-孕烯:
其中
X'是
氟或
氯
X2 是氢、
氟或
氯
X3 是氢、
氟、
氯或
溴;
X4 是 =C=O 或
或可以是
当 X3 为
氯时;
R' 是氢、
氟、
氯、
溴、羟基或甲氧基;
R2 是
氟代、
氯代、羟基或 2 至 6 个碳原子的烷酰氧基。
当 R' 为氢或 R2 与 R1 相同时,R2 为
氟、
氯、羟基或 2 至 6 个碳原子的烷酰氧基
当 R' 为
氟、
氯、羟基或甲氧基时;
当 R4 为 a-甲基或 β-甲基时,R3 为羟基或 2 至 6 个碳原子的烷酰氧基,或 R3 和 R4 合在一起为
和
类
固醇核 A 环上 1 位和 2 位之间的实线和断线代表单键或双键;对哺乳动物具有局部抗炎活性。它们可以通过将相应的 A5 化合物与碱接触来制备。17a-alkanoyloxy 化合物可通过酯化相应的 17a-hydroxy 化合物制备。