6-chloro-2-(2-fluoro-4-iodo-phenylamino)-5-methyl-nicotinic acid methyl ester 、
三氟甲烷磺酸甲酯 在
甲苯 、
甲基叔丁基醚 作用下,
以
甲苯 为溶剂,
反应 24.0h,
以to provide 2-Chloro-6-(2-fluoro-4-iodo-phenylamino)-5-methoxycarbonyl-1,3-dimethyl-pyridinium trifluoromethanesulfonate (760 mg @ 88% w/w, corrected yield 48%), δH (400 MHz, CDCl3) 2.53 (3H, s, ArCH3), 3.91-3.90 (6H, m, NCH3/COOCH3), 7.30 (1H, d, J8.5, ArH), 7.53 (1H, dd, J10, 2, ArH), 7.59 (1H, d, J8.5, ArH), 8.58 (1H, s, ArH), 10.63 (1H, s, NH)的产率得到2-chloro-6-(2-fluoro-4-iodo-phenylamino)-5-methoxycarbonyl-1,3-dimethyl-pyridinium trifluoromethanesulfonate