| abstract |
Disclosed is a method for preparing a compound of Formula 1 by contacting compound of Formula 2 with R-NH 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. ( 1, 2, 4 ) wherein R is H, C_C alkyl, cyclopropyl, cyclopropylmethyl or methylcyclopropyl; R is CH or C1; R is C_Calkyl or C_ C alkenyl, each optionally substituted with up to 3 halogen and up to 1 phenyl; and X is C1 or Br. Also disclosed is a method for preparing a compound of Formula 5, wherein R, R, R 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. |