methyl 4-hydroxy-2-ethyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide 、
2-氨基-6-氯吡嗪 以
邻二甲苯 为溶剂,
以yielding 7.3 g (64% of theory) of N-(6-chloro-pyrazin-2-yl)-2-ethyl-4-hydroxy-2H-1,2-benzothiazine-3-carboxamide-1,1-dioxide的产率得到N-(6-chloro-pyrazin-2-yl)-2-ethyl-4-hydroxy-2H-1,2-benzothiazine-3-carboxamide-1,1-dioxide