靛红酸酐 、
6-chloro-7-methyl-3-(2-methoxyphenylamino)-1,4,2-benzodithiazine 1,1-dioxide 以
甲苯 为溶剂,
反应 44.0h,
以94%的产率得到6'-chloro-5-(2-methoxyphenyl)-7'-methyl-1',1'-dioxospiro[4H-benzo[d][1,3,7]oxadiazocine-4,3'(2'H)-[1,4,2]benzodithiazine]-2,6(1H,5H)dione