Following a previous experiment, an original heteropolycyclic structure 4 was obtained by a reaction of chloroacetyl chloride with compound 3 bearing a conjugated double bond system. The condensation develops with an initial NH-chloroacetylation and ring closure by quaternarization of the pyridine nitrogen. This is achieved through an 1,4-cycloaddition of chloroketene to make a pyranone ring.
根据先前的实验,通过
氯乙酰氯与带有共轭双键系统的化合物3的反应获得了原始的杂多环结构4。最初的NH-
氯乙酰化和
吡啶氮的季
铵化使环闭合,从而形成缩合反应。这是通过
氯乙烯酮的1,4-环加成反应生成
吡喃酮环而实现的。