The reaction of 2-bromo-7-methoxytropone with o-aminophenol gave 2-bromo-7-(o-hydroxyanilino)tropone (9), besides small amounts of cyclohepta[b][1,4]benzoxazin-6(11H)-one (10) and 15H-[1,4]benzoxazino[3′,2′ : 3,4]cyclohepta[2,1-b][1,4]benzoxazine (11). The heating of 9 with a strong acid afforded 6-bromocyclohepta[b][1,4]benzoxazine (13) quantitatively. On the other hand, the heating of 13 with o-aminophenol in ethanol gave 10, while in acetic acid a mixture of 10 and 11 was obtained. The mechanism of the formation of these products is discussed.
2-bromo-7-methoxytropone 与邻
氨基苯酚反应得到 2-bromo-7-(o-hydroxyanilino)tropone (9),此外还有少量的
环庚烷并[b][1,4]苯并恶嗪-6(11H)-酮 (10) 和 15H-[1,4]benzoxazino[3′,2′ :3,4]cyclohepta[2,1-b][1,4]benzoxazine (11).用强酸加热 9 可以定量得到 6-
溴环庚烷并[b][1,4]苯并恶嗪(13)。另一方面,在
乙醇中用邻
氨基苯酚加热 13 得到 10,而在
乙酸中则得到 10 和 11 的混合物。本文讨论了这些产物的形成机理。