4-chlorocoumarin-3-carbaldehyde (1a) or its N-methyl-2-quinolone analogue (1b) via subsequent Knoevenagel condensation and ring closure reaction known as the ‘tert-amino effect’. These are rare examples of the tert-amino effect occurring at 2-pyrone and 2-pyridone ring. An unusual intramolecular redox reaction of the iminium ion 6, reported earlier, most probably follows analogous mechanism as the tert-amino
一些新颖的1,2-稠合的5 H - chromeno [4,3- b ]
吡啶-5-酮(5a,b)和6 H-苯并[ h ] [1,6]
萘啶5-one(5c)由4-
氯香豆素-3-
甲醛(1a)或其N-甲基-2-喹诺
酮类似物(1b)经随后的Knoevenagel缩合和称为“叔
氨基效应”的闭环反应合成。这些是在2-
吡喃酮和2-
吡啶酮环上发生的叔
氨基效应的罕见例子。
亚胺离子6的异常分子内氧化还原反应,较早前报道,最有可能遵循类似的机制,导致5的叔
氨基效应反应。