A variety of N-alkyl-N'-pyridyl-N"-cyanoguanidines III was prepared as potential bioisosteres of hypotensive N-alkyl-N'-pyridylthioureas Ia. Optimal activity of the N,N'-disubstituted cyanoguanidines III was assoicated with the presence of four to seven carbon branched alkyl and 3- or 4-pyridyl groups. Maximum potency was displayed by N-tert-pentyl-N'-3 pyridyl-N"-cyanoguanidine (20). This compound
制备了多种N-烷基-N'-
吡啶基-N“-
氰基
胍III作为降压N-烷基-N'-
吡啶基
硫脲Ia的潜在
生物等排体。N,N'-二取代的
氰基
胍III的最佳活性与N-叔戊基-N'-3
吡啶基-N”-
氰基
胍(20)显示出最大的效力。在高血压大鼠和狗中,该化合物的功效比相应的
硫脲强200倍。与
甘菊定(20的去3-
吡啶基类似物)相比,使用20及其叔丁基类似物19可以使自发性高血压大鼠的功效提高150倍。观察到的活性似乎是由于直接血管引起的松弛。以重量计,化合物19、20、50,