The present invention provides an industrially advantageous method for producing a 1,4-benzoxazine compound useful as a medicine while avoiding safety and health risks. Specifically, the present invention provides a method for producing a 1,4-benzoxazine compound [A], which comprises the three steps in the following scheme, namely, a step of converting the amino group at 7-position in a compound [a] into a dimesylamino group, a step of coupling a compound [b] with a boronic acid compound, and a step of converting the 7-position in a compound [c] into a monomesylamino group.
In the above scheme, Ms is a methanesulfonyl group, and each of R′ and R″ is a hydrogen atom etc.
本发明提供了一种在避免安全和健康风险的情况下生产用作药物的1,4-苯并噁嗪化合物的工业优势方法。具体而言,本发明提供了一种生产1,4-苯并噁嗪化合物[A]的方法,该方法包括以下方案中的三个步骤,即将化合物[a]中7位的
氨基转化为二甲基磺酰
氨基,将化合物[b]与
硼酸化合物偶联,以及将化合物[c]中的7位转化为单甲基磺酰
氨基。在上述方案中,Ms为甲磺酰基,R'和R''分别为氢原子等。