The problem to be solved is to provide a method for efficiently producing compounds (1) and (1a) that are important intermediate compounds in the production of FXa inhibitors (X) and (X-a). The solutions thereto are a method for producing a compound represented by the formula (8d) using a stereoselective intramolecular cyclization reaction, and a method for producing a compound (1f) or a salt thereof, or a hydrate thereof, which is characterized by desulfonylation of the compound (8d). In each formula, R
4a
represents a C1-C6 alkyl group, a benzyl group, etc.
需要解决的问题是提供一种高效生产FXa
抑制剂(X)和(X-a)的重要中间化合物(1)和(1a)的方法。其解决方案是使用立体选择性分子内环化反应生产由公式(8d)表示的化合物的方法,并通过去磺酰化化合物(8d)生产化合物(1f)或其盐或
水合物的方法。在每个公式中,R4代表C1-C6烷基,苄基等。