| 摘要 |
NEW MATERIAL:The aminobenzoxazine derivative of formula I (R<1> is alkyl, alkenyl, alkynyl, alkoxyalkyl or alkoxyalkoxyalkyl; R<2> is H or CH3). EXAMPLE:6-Amino-7-fluoro-4-propargyl-2H-1,4-benzoxazin-3(4H)-one. USE:Intermediate of herbicide. PREPARATION:The compound of formula I can be produced by reducing the compound of formula II with iron powder. The obtained compound of formula I can be converted to the compound of formula III useful as a herbicide by reacting with 3,4,5,6-tetrahydrophthalic anhydride. The starting compound of formula II can be produced by reducing and cyclizing the compound of formula IV (R<3> is lower alkyl) with iron powder, selectively nitrating the resultant compound of formula V with a mixture of sulfuric acid and nitric acid, and reacting the obtained compound of formula VI with the compound of formula R<1>-X (X is halogen). |
