Method for producing alkylamine derivative and production intermediate thereof

A method for producing an alkylamine derivative having a urea bond represented by formula (I) or a salt thereof, the method comprising the following steps (a) and (b): step (a): step (b): a step for deprotecting the reaction product obtained in step (a) if necessary; as a result, provided is a method for industrially producing an alkylamine derivative having a urea bond represented by formula (I), which is a compound that is very useful as an agent having a CaSR agonist effect. 以式(I)表示的具有脲键的烷基胺衍生物或其盐的制造方法，该方法包括以下的工序(a)、(b)，工序(a)：工序(b)：根据需要对通过工序(a)得到的反应产物进行脱保护的工序；由此提供一种作为具有CaSR激动剂作用的药剂非常有用的化合物、即以式(I)表示的具有脲键的烷基胺衍生物的适合于工业化的制造方法。