| 摘要 |
<p>The process of the present invention relates to the preparation of precursor trisubstituted benzoic acid intermediates having structural formula (I) wherein R is -COORa wherein Ra is C1-C6 alkyl; C1-C4 alkyl; formyl or C(O)Rb wherein Rb is C1-C4 alkyl; R1 is hydrogen, halogen, nitro, C¿1?-C2 alkyl, C1-C2 alkoxy or trifluoromethyl; R?2¿ is hydrogen, halogen, C¿1?-C4 alkoxy, C1-C4 alkyl -OCH2CH2OCH3, -OCH2CH2OC2H5 or a substituted methyl group and R?3 is C¿1-C4 alkyl or C1-C4 haloalkyl.</p> |
