| 摘要 |
This invention relates to a method for preparing a compound of Formula 1 wherein L, R, Rand X are as defined in the disclosure, comprising contacting a 2 pyrazoline of Formula 2 with bromine at a temperature of at least about . This invention also discloses preparation of a compound of Formula 3 wherein X, Z, R, R, R, R, Rand n are as defined in the disclosure, using a compound of Formula 1a wherein Ris as defined in the disclosure, prepared by the aforesaid method for preparing a compound of Formula 1.1,2,3,1a, |
