There is provided a method for producing with a high efficiency a heterocyclic compound that is useful as a raw material for pharamaceuticals. A novel production method for producing 2,2,7,9-tetramethyl-2H-pyrano[2,3-g]quinoline (compound (6)) that has a quinoline ring and a chromene ring using N-(3-acetyl-4-hydroxyphenyl)butylamide (compound (1′)) that is commercially available as a raw material for pharamaceuticals or the like as a starting raw material; and a method for purifying compound (6), characterized by purifying by subjecting it to conversion into a salt form.
提供了一种高效的方法来生产一种
杂环化合物,该化合物可用作制药原料。使用商业上可用的N-(3-乙酰基-
4-羟基苯基)丁酰胺(化合物(1'))作为起始原料,通过一种新的生产方法生产具有
喹啉环和咔啉环的2,2,7,9-四甲基-
2H-吡喃[2,3-g]
喹啉(化合物(6));以及通过将其转化为盐形式进行纯化的化合物(6)的纯化方法。