Problem to be solved: to provide a novel method for producing a triazolo pyridine compound or its salt, which is useful for treatment or prevention of a disease, which has a PhD inhibitory effect and is caused by reduced production of EPO.Compound [vi]:(R61, R62 and R111 independently represent the protective groups of carboxyls, x91 represents the release groups). A method for producing 2 - ({[7-hydroxy-5 - (2-phenylethyl) - [1,2,4] triazolo [1,5-a] pyridine-8-yl] carbonyl} amino) acetic acid, or the process of reacting the salt thereof.No selection【課題】PHD阻害作用を有し、EPOの産生低下に起因する疾患の治療または予防等に有用な、トリアゾロピリジン化合物又はその塩の新規製造方法を提供する。【解決手段】化合物[VI]：（式中、R61、R62及びR111は、それぞれ独立して、カルボキシの保護基を表し、X91は脱離基を表す。）又はその塩を反応させる工程を含む、2-({[7-ヒドロキシ-5-(2-フェニルエチル)-[1,2,4]トリアゾロ[1,5-a]ピリジン-8-イル]カルボニル}アミノ)酢酸の製造方法。【選択図】なし
