Synthesis and structure–activity relationships of 2-(substituted phenyl)-3-[3-(N,N-dimethylamino)propyl]-1,3-thiazolidin-4-ones acting as H1-histamine antagonists
摘要:
2-(Substituted-phenyl)-3-[3-(N,N-dimethylamino)propyl]-1,3-thiazolidin-4-ones (1-15) showed dependence of the potency of the H-1-histamine antagonism on the m- and p-substituents suggesting that the aromatic moiety binds the receptor by a strong pi-interaction. Electron-withdrawing substituents decrease the potency while the electron-donating alkyl substituents, enhancing the aryl HOMO energy, increase the antihistamine activity. The m-substituents with the capability to form hydrogen bonds, seems to share an extrainteraction with hydrogen accepting or donating groups of the histamine receptor and exhibits very high potency. (C) 1999 Elsevier Science S.A. All rights reserved.