A process for the preparation of carboxylic acids represented by a formula ##STR1## wherein R.sub.1 represents hydrogen atom or a lower alkyl radical, R.sub.2 represents hydrogen atom, lower alkyl or allyl radical and R.sub.3 represents phenyl, substituted phenyl, substituted naphthyl, dibenzofuranyl or substituted biphenyl. Following novel enamine and amidine compounds as intermediates for manufacturing the carboxylic acids and processes for the manufacture of said enamine and amidine compounds ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 represent the meanings as referred to and R.sub.4 represents dimethylamino, pyrrolidyl, piperidyl or morpholyl.
一种制备由式##STR1##所表示的
羧酸的方法,其中R.sub.1代表氢原子或较低的烷基基团,R.sub.2代表氢原子、较低的烷基或烯丙基基团,R.sub.3代表苯基、取代苯基、取代
萘基、
二苯并呋喃基或取代
联苯基。以下是制造
羧酸的新型恩酰胺和酰胺化合物的中间体,以及制造所述恩酰胺和酰胺化合物的方法##STR2##其中R.sub.1、R.sub.2和R.sub.3代表所述含义,R.sub.4代表
二甲氨基、
吡咯烷基、
哌啶基或吗啉基。