Cyanoguanidine-thiourea equivalence in the development of the histamine H2-receptor antagonist, cimetidine
作者:G. J. Durant、J. C. Emmett、C. R. Ganellin、P. D. Miles、M. E. Parsons、H. D. Prain、G. R. White
DOI:10.1021/jm00217a007
日期:1977.7
which are antagonists of decreased potency. The guanidine is very basic and at physiological pH is completely protonated. However, introduction of strongly electronegative substituents into the guanidine group reduces basicity and gives potent H2-receptor antagonists, viz. the cyanoguanidine 2b (cimetidine, "Tagamet") and nitroguanidine 2e. A correspondence between the activity of thioureas and cyanoguanidines