Intramolecular reactions of N-nitrenes: oxidation of 3-amino-2-(2,4-dimethoxyphenylbutyl)quinazolin-4(3H)-ones
作者:Robert S. Atkinson、Nagwa A. Gawad
DOI:10.1039/p19850000825
日期:——
The N-nitrenes generated by oxidation of N-aminoquinazolones (1) and (2) are trapped by the remote 2,4-dimethoxyphenyl ring. Oxidation of (1) in benzene gives the metacyclophane (3) in 60% isolated yield whereas oxidation in methanol gives (5), (6) and (8). The structures of the acetal (5) and the imine (8) have been confirmed by X-ray crystallography. Oxidation of (2) in methanol yields (11) and (16)
由N-氨基喹唑酮(1)和(2)的氧化产生的N-氮烯被远端的2,4-二甲氧基苯基环捕获。在苯中氧化(1)可以得到60%的分离产率的间环烷(3),而在甲醇中氧化则可以得到(5),(6)和(8)。乙缩醛(5)和亚胺(8)的结构已经通过X射线晶体学证实。在甲醇中氧化(2)得到(11)和(16))。提供了对由(1)衍生的N-亚硝基对二甲氧基苯基环的2,3-或5,6-双键的攻击的选择性的解释。