反应详情

4-Hydroxy-2-methyl-2H-naphtho[2,1-e]-1,2-thiazine-3-carboxylic acid ethyl ester-1,1-dioxide was prepared analogous to Example 1c from 4-hydroxy-2H-naphtho[2,1-e]-1,2-thiazine-3-carboxylic acid ethyl ester-1,1-dioxide and methyl iodide. Yield: 82% of theory; m.p. 163°-165° C.