Disclosed is a method for preparing a compound of Formula 1 by contacting compound of Formula 2 with R1—NH2 in the presence of a carboxylic acid and a method for preparing a compound of Formula 2 by contacting a compound of Formula 4 with phosphorus tribromide.
wherein R1 is H, C1-C4 alkyl, cyclopropyl, cyclopropylmethyl or methylcyclopropyl; R2 is CH3 or Cl; R3 is C1-C6 alkyl or C3-C6 alkenyl, each optionally substituted with up to 3 halogen and up to 1 phenyl; and X is Cl or Br.
Also disclosed is a method for preparing a compound of Formula 5
wherein R4, R5, R6 and Z are as defined in the disclosure,
using a compound of Formula 1 that is characterized by preparing the compound of Formula 1 by the method above.
本发明涉及一种通过在
羧酸存在下将化合物式为2的化合物与R1-NH2接触制备化合物式为1的方法,以及通过将化合物式为4的化合物与
三溴化磷接触制备化合物式为2的方法。其中,R1为H、C1-C4烷基、环丙基、
环丙基甲基或甲基环丙基;R2为
CH3或Cl;R3为C1-C6烷基或C3-C6烯基,每个基可选地被取代为最多3个卤素和最多1个苯基;X为Cl或Br。此外,还公开了一种制备化合物式为5的方法,其中R4、R5、R6和Z如本公开所定义,使用上述方法制备的化合物式为1的化合物来表征化合物式为1。