3-(5-chloro-2-methoxy-benzenesulfonylamino)-4-hydroxy-5-trifluoromethyl-benzoic acid methyl ester 、
1,2-二溴乙烷 以yielding 4-(5-chloro-2-methoxy-benzenesulfonyl)-8-trifluoromethyl-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid methyl ester, which的产率得到4-(5-chloro-2-methoxy-benzenesulfonyl)-8-trifluoromethyl-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid methyl ester