avoided the formation of seven-membered ring with either isomerisation or degradation involving cleavage of C-N bond assisted by neighbouring group participation of the hydroxyl group. The sequence of ring closures depends on the ring substituents and the lengths of side chains. The reaction mechanism is also influenced by the site of the protonation. The structures of the new tetracycles were proved
使用
高氯酸将2-(ω-羟基烷基)-4-(ω)'-羟基烷基-
氨基)
酞嗪酮及其6,7-二甲氧基衍
生物转化为同时包含亚
氨基醚和am部分的四环阳离子。2-(
4-羟基) utyl)链避免了七元环的形成,无论是异构化还是降解都涉及羟基相邻基团的参与辅助CN键的裂解。闭环的顺序取决于环取代基和侧链的长度。反应机理也受质子化位点的影响。新的四环化合物的结构通过1 H-和13 C-nmr光谱证明。