Benzylpiperazine Derivatives. IX. Structure-Antiulcer Activity Studies of 1-(Aminocarbonylalkyl)-4-benzylpiperazine Derivatives by the Adaptive Least-Squares Method

Abstract

Quantitative structure-antiulcer activity relationships of 1-(aminocarbonylalkyl)-4-benzylpiperazine derivatives (I) were analyzed by using the adaptive least-squares (ALS) technique. Discriminant functions show that (1) a bulky amide moiety is disadvantageous, (2) a small number of methylene groups between carbonyl and piperazine is favorable, (3) a substituent which has a large B₁ value (or B₂ value when the substituent is forced to be in the in-plane conformation) with low lipophilicity at the 3 and/or 4 position of the benzyl moiety is favorable for antiulcer activity with low acute toxicity.