para‐TsOH‐promoted cascade reaction of easily prepared ortho‐propynol phenyl azides for the synthesis of 4‐methoxy quinolines has been developed. This reaction proceeded in a new way to generate 4‐methoxy quinolines through a concerted nucleophilic mechanism of propargyl methyl ether. It is worth noting that propargyl methyl ether can be successfully transformed into 4‐methoxy quinolines only when substrates contain a strong electron‐donating group (OR).

中文翻译：

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邻苯丙酚苯叠氮化物的对-TsOH促进的级联反应，用于合成4-甲氧基喹啉和炔丙基甲基醚：炔丙醇机理的见解

已开发出对-TsOH促进的易于制备的邻丙炔丙二醇叠氮化物的级联反应，用于合成4-甲氧基喹啉。该反应以一种新的方式进行，通过炔丙基甲基醚的协同亲核机理生成4-甲氧基喹啉。值得注意的是，只有在底物包含强供电子基团（OR）时，炔丙基甲基醚才能成功转化为4-甲氧基喹啉。