| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a new method for producing a 3-oxo-1,4-benzoxazine derivative. <P>SOLUTION: In the method, a compound represented by formula (2) is produced from a compound represented by formula (3) or (10), and the 3-oxo-1,4-benzoxazine derivative represented by formula (1) is produced therefrom, wherein R<SP POS="POST">1a</SP>represents a halogen atom, 1C-6C alkyl which may be substituted, or the like; R<SP POS="POST">1b</SP>represents 1C-6C alkyl which may be substituted; R<SP POS="POST">1c</SP>and R<SP POS="POST">1d</SP>each independently represents 1C-6C alkyl which may be substituted, or the like; R<SP POS="POST">4</SP>represents a hydrogen atom, 1C-4C alkyl or the like; X<SP POS="POST">1</SP>represents a halogen atom; and X<SP POS="POST">2</SP>represents a hydroxy, halogen atom or the like. <P>COPYRIGHT: (C)2012,JPO&INPIT |
