A novel photochemical ring-contraction reaction of 5-unsubstituted 3, 1-benzoxazepines and their 5-halogeno or carboxyl derivatives to yield 3-formylindoles in an aprotic solvent is reported. This ring contraction was successfully extended to oxazepines having an alkoxycarbonyl function at the 5-position to give the indoles having this function at the 3-position. Though most of the oxazepines underwent the ring-contraction reaction only on irradiation at 254 nm, 5-carboxy derivatives or their esters afforded the ring-contraction products even at ≥ 300 nm. The intermediacy of 3H-indole species in these photochemical ring-contraction reactions was demonstrated by the isolation of methyl 3-acetyl-2-phenyl-3H-indole-3-carboxylate during the photolysis of methyl 4-methyl-2-phenyl-3, 1-benzoxazepine-5-carboxylate. It was found that this 3H-indole afforded methyl 6-and 4-acetyl-2-phenyl-indole-3-carboxylates upon further irradiation. The mechanism of this acetyl migration is discussed based on the result of the photochemical acetyl migration of methyl 1-acetyl-2-phenylindole-3-carboxylate.
报道了一种在非质子溶剂中,5-未取代的3,1-苯并噁嗪和其5-卤素或羧基衍
生物发生的新型光
化学环收缩反应,生成3-甲酰基
吲哚。这种环收缩反应成功扩展到5-位具有烷氧羰基功能的噁嗪,生成3-位具有该功能的
吲哚。尽管大多数噁嗪仅在254 nm波长下发生环收缩反应,5-羧基衍
生物或其酯甚至在≥ 300 nm波长下也能生成环收缩产物。通过在4-甲基-2-苯基-3,1-苯并噁嗪-5-
羧酸甲酯的光解过程中分离出甲基3-乙酰基-2-苯基-
3H-吲哚-3-
羧酸酯,证明了这些光
化学环收缩反应中
3H-吲哚的中间体性质。发现进一步的辐照使这种
3H-吲哚生成甲基6-和4-乙酰基-2-苯基-
吲哚-3-
羧酸酯。根据甲基1-乙酰基-
2-苯基吲哚-3-
羧酸酯的光
化学乙酰迁移结果,讨论了这种乙酰迁移的机制。