Alkylation of ethyl nipecotate with bromides VII - X gave amino esters Ib - Vb. Alkylation of ethyl piperazine-2-carboxylate with 4-bromo-1,1-diphenyl-1-butene afforded compound Vb. Final product Ia - Va were obtained by acid hydrolysis of corresponding esters Ib - Vb. Some of the compounds showed significant antihistamine and antiulcer activities.
乙基尼派可酸与溴代烷基化反应得到氨基酯。乙基哌嗪-2-羧酸乙酯与4-溴-1,1-二苯基-1-丁烯发生烷基化反应,得到化合物Vb。通过对应酯的酸水解获得最终产物Ia-Va。部分化合物表现出显著的抗组胺和抗溃疡活性。