| 摘要 |
<p>Disclosed is a method for preparing a compound of Formula 1 by contacting compound of Formula 2 with R 1 -NH 2 in the presence of a carboxylic acid, and the compound of Formula 2 may be prepared by contacting a compound of Formula 4 with phosphorus tribromide.
wherein R 1 is H, C 1 -C 4 alkyl, cyclopropyl, cyclopropylmethyl or methylcyclopropyl; R 2 is CH 3 or Cl; R 3 is C 1 -C 6 alkyl or C 3 -C 6 alkenyl, each optionally substituted with up to 3 halogen and up to 1 phenyl; and X is Cl or Br.</p> |
