The medium-ring
heterocyclic derivative 1,9,10-trimethoxy-5-methyl-1,3,4,5,6,7-hexahydro-2,5- benzoxazonine (6a) was obtained in fair yield from photosolvolysis of 8,9-dimethoxy-4-methyl-
2,3,6,10b-tetrahydro-5H-oxazolo[2,3-a]isoquinolinium iodide (5a) in methanol, together with minor
amounts of 3,9,10-trimethoxy-5-methy1-1,3,4,5,6,7-hexahydro-2,5-benzoxazonine
(8) and 2-[N-2- 2-(dimethoxymethyl)-4,5-dimethoxyphenyl}ethyl-N-methylamino]ethanol (7). Photosolvolysis
products analogous to (6a) were obtained from other related lob-substituted oxazolo[2,3-aliso-quinolinium iodides in high to low yields
depending upon the nature of the angular substituent and the presence or
absence of substituents in the fused aromatic ring. No methanolysis of the
methiodide salts (5a-f) was observed in the absence of ultraviolet irradiation,
whereas 1-(2-ethenyl- 4,s-dimethoxypheny1)ethanone
(14) was formed on heating (5b) with methanolic
potassium hydroxide. Attempted synthesis of
1,2,4,5,6,7-hexahydro-3,5-benzoxazonine derivatives by photosolvolysis
of 8,9-dimethoxy-4-methyl-1,5,6,10b-tetrahydro-3H-oxazolo[4,3-a]isoquinolinium iodide (17) in methanol or water was
unsuccessful, ring-opened products being obtained in low yield instead.
中环
中环杂环衍生物 1,9,10-三甲氧基-5-甲基-1,3,4,5,6,7-六氢-2,5-苯并噁唑嗪(6a)是由 8,9-二甲氧基-4-甲基-
2,3,6,10b-四氢-5H-恶唑并[2,3-a]异喹啉鎓碘化物(5a)在甲醇中的光解作用,以及少量的
和少量 3,9,10-三甲氧基-5-甲基 1-1,3,4,5,6,7-六氢-2,5-苯并噁唑嗪
(8) 和 2-[N-2-2-(二甲氧基甲基)-4,5-二甲氧基苯基}乙基-N-甲基氨基]乙醇 (7)。光解
从其他相关的裂片取代的噁唑并[2,3-喹啉]碘化物中获得了类似于 (6a) 的光解产物,产率从高到低不等。
根据角状取代基的性质以及是否存在
在融合芳香环中是否存在取代基。碘甲烷盐(5
在没有紫外线照射的情况下,碘甲烷盐(5a-f)没有发生甲烷分解、
而 1-(2-乙烯基- 4,s-二甲氧基苯基1)乙酮
(14) 在用甲醇氢氧化钾加热 (5b) 时生成。
氢氧化钾。尝试合成
尝试通过光解 8,9- 二甲氧基-4,8,9-苯并噁唑嗪衍生物
在甲醇或水中通过光解 8,9-二甲氧基-4-甲基-1,5,6,10b-四氢-3H-恶唑并[4,3-a]异喹啉鎓碘化物 (17)
但并不成功,反而得到了低产率的开环产物。