| 摘要 |
<p>A process for preparing acid salts (2) of η-(piperidyl)butyric acid by hydrogenating an acid salt (1) of η-(pyridyl)butyric acid (preferably, one prepared through the following steps (a) and (b) and having a content of acid salts (3) of bis(pyridylethyl)acetic acid of not more than 3 % by weight) in a solvent in the presence of a catalyst, wherein a rhodium, palladium or ruthenium catalyst is used as the catalyst. Step (a): a vinylpyridine compound (4) is reacted with a diester (5) of malonic acid in the presence of a base to prepare a diester (6) of 2-(pyridylethyl)malonic acid. Step (b): the diester (6) prepared in the step (a) is hydrolyzed and decarboxylated in an aqueous acid solution to prepare the acid salt (1) of η-(pyridyl)butyric acid.</p> |
