4-Halo-etianic acids and derivations of the formula:
wherein
X1 is fluoro or chloro;
X2 is fluoro, chloro or hydrogen;
X3 is fluoro, chloro, bromo or hydrogen;
X4 is =C=O or
of may be
when X3 is chloro;
R is hydrogen, alkyl of one to six carbon atoms optionally substituted with one halo, or phenyl or benzyl optionally substituted on the phenyl ring with a substituent selected from alkyl of one to four carbon atoms, alkoxy of one to four atoms and halo;
R' is hydrogen or alkanoyl of 2 to 6 carbon atoms;
R2 is hydrogen, a-methyl or β-methyl; and
the solid and broken lines between C-1 and C-2 represent a double or a single bond. The compounds wherein R is other than hydrogen are useful as anti-inflammatory agents. They can be prepared by esterifying the corresponding acid. The 17a-esters can be prepared by esterifying the corresponding 17a-hydroxy compounds. The 17β-carboxylic group can be introduced by oxidising the corresponding 20-oxo-21-hydroxy (or alkanoyloxy) compound. The double bond at the 4,5 position is produced by contacting the corresponding Δ5 compound with a base.
4-Halo-etianic acids 及其衍
生物式:
其中
X1 是
氟或
氯
X2 是
氟、
氯或氢
X3 是
氟、
氯、
溴或氢;
X4 是 =C=O 或
的可以是
当 X3 为
氯时;
R 是氢、1 至 6 个碳原子的烷基,可选择被 1 个卤素取代,或苯基或苄基, 在苯基环上可选择被选自 1 至 4 个碳原子的烷基、1 至 4 个原子的烷氧基和卤素的取代基取代;
R' 是氢或 2 至 6 个碳原子的烷酰基;
R2 是氢、a-甲基或 β-甲基;以及
C-1 和 C-2 之间的实线和断线代表双键或单键。其中 R 为氢以外的化合物可用作抗炎剂。它们可以通过酯化相应的酸来制备。17a-酯可通过酯化相应的 17a- 羟基化合物制备。17β-羧基可以通过氧化相应的 20-氧代-21-羟基(或烷酰氧基)化合物来引入。4,5 位的双键是通过相应的 Δ5 化合物与碱接触产生的。