2'-ethyl-2',3'-dihydro-spiro[[1,3]dioxolane-2,4'-naphtho[2,1-e][1,2]thiazine] 1',1'-dioxide 、
盐酸 在
乙醇 作用下,
以
甲醇 为溶剂,
反应 1.0h,
以yielded 7.9 gm (84% of theory) of 2-ethyl-2H-naphtho[2,1-e]-1,2-thiazine-4(3H)-one-1,1-dioxide, m.p. 146°-147° C.的产率得到2-ethyl-1,1-dioxo-2,3-dihydro-1
H-1λ
6-naphtho[2,1-
e][1,2]thiazin-4-one