substituents and a 3-4-carbon alkyl side chain had significantly greater analgesic activity than that of the oxazolo[4,5-b]pyridin-2(3H)-one analogs. To reduce the metabolic N-dealkylation of the piperazine observed in our previous work on oxazolo[4,5-b]-pyridin-2(3H)-ones, analogs of the most active compounds with steric hindrance on the alkyl side chain were prepared and tested. The compound with the maximal
一系列的1-(
氨基烷基)-和1-[(4-芳基-1-
哌嗪基)烷基]
恶唑并[5,4-b]
吡啶-2(1H)-
恶唑并[5,4-b]的一个衍
生物在小鼠和大鼠中测试了对烷基侧链的长度和
氨基或4-芳基-1-
哌嗪基取代基进行修饰的
吡啶2-2(1H)-1的安全性和镇痛效果。一些具有4-(取代或未取代的苯基)-1-
哌嗪基取代基和3-4-碳烷基烷基侧链的化合物具有比oxazolo [4,5-b] pyridin-2(3H)-高的镇痛活性。一个类似物。为了减少我们先前在
恶唑[4,5-b]-
吡啶-2(3H)-酮上的工作中观察到的
哌嗪的代谢性N-脱烷基,制备了在烷基侧链上具有位阻的最具活性的化合物的类似物和测试。具有最大安全性和止痛效果的化合物为1-[[[4-(4-
氟苯基)-1-
哌嗪基]丙基]
恶唑并[5,4-b]
吡啶-2-2(1H)-one(化合物3b) ,ED50值为5.6 mg / kg po(小鼠,苯醌扭曲试验)和0