α-acetic acid. The 6-methyl- and 6-bromo-derivatives of 1a behaved similarly when reacted with sodium hydroxide but when 3,4-dihydro-4-hydroxy-3-oxo-2H-1,4-benzothiazine was so treated a more complex reaction occurred.Methyl (6-bromo-3,4-dihydro-4-hydroxy-3-oxo-2H-1,4-benzothiazin-2-yl)acetate was also treated with hydrochloric acid. The two products isolated were (6-bromo-3,4-dihydro-3-oxo-2H-1,4-ben
用
氢氧化钠处理 (3,4-dihydro-4-hydroxy-3-oxo-2H-1,4-benzothiazin-2-yl)
乙酸 (1a) 产生相应的内酰胺,即 (3,4-dihydro- 3-oxo-2H-1,4-benzothiazin-2-yl)
乙酸,连同 α,β-不饱和酸,3,4-dihydro-3-oxo-2H-1,4-benzothiazine-Δ2,α -
醋酸。1a 的 6-甲基-和 6-
溴-衍
生物在与
氢氧化钠反应时表现相似,但当 3,4-二氢-
4-羟基-3-氧代-2H-1,4-苯并
噻嗪如此处理时,反应更为复杂(6-
溴-3,4-二氢-
4-羟基-3-氧代-2H-1,4-苯并
噻嗪-2-基)
乙酸甲酯也用
盐酸处理。分离出的两种产物是(6-bromo-3,4-dihydro-3-oxo-2H-1,4-benzothiazin-2-yl)
乙酸和(6-bromo-7-chloro-3,4-dihydro-