The problem to be solved is to provide a method for producing a compound having excellent activity as an α
2
δ ligand. The solution thereto is a method for producing a compound represented by the general formula (VI) or a salt thereof via an iminium salt: [in the formula, R
1
: a hydrogen atom or a C1-C6 alkyl group]
需要解决的问题是提供一种生产作为α2δ
配体具有优异活性的化合物的方法。其解决方法是通过
亚胺盐生产代表通式(VI)或其盐的化合物的方法:[在公式中,R1:氢原子或C1-C6烷基]