| abstract |
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 C1; 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. |