6-chloro-2-methylsulfanyl-4H-benzo[d][1,3]thiazine 、 3-氯苯胺 在
ice 、 water ethanol 作用下,
以
正丁醇 为溶剂,
反应 16.0h,
以to give 48 g (52%) of title product, m.p. 174°-175°的产率得到6-chloro-2-(3-chloroanilino)-4H-3,1-benzothiazine
Certain 2-anilino-4H-3,1-benzothiazines of the formula: ##STR1## wherein R.sub.1 is hydrogen and R.sub.2 is 4-dimethylamino, 5-chloro-2,4-dimethoxy or 3,4-dichloro; and R.sub.1 is chloro and R.sub.2 is 4-acetyl or 3-chloro are effective anthelmintic agents.