A convenient strategy is present for easy construction of a series of 4-halo-2H-chromenes and 1,2-dihydroquinolines through Brønsted acid-mediated cascade cyclization of readily accessible 2-propynolphenols/anilines. Our developed approaches prove have good functional-group applicabilities and could be enlarged to gram quantities in high yields. Moreover, the resulting halides could be further exploited in subsequent palladium-catalyzed coupling reactions.

中文翻译：

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布朗斯台德酸介导的2-丙炔酚/苯胺的级联环化反应，生成4-卤代-2 H-色烯和1,2-二氢喹啉

目前存在一种方便的策略，可通过布朗斯台德酸介导的易于获得的2-丙炔酚/苯胺的级联环化，轻松构建一系列的4-卤代2 H-苯甲基和1,2-二氢喹啉。我们开发的方法证明具有良好的官能团适用性，并且可以高产量地扩大到克量。此外，所得的卤化物可在随后的钯催化的偶联反应中进一步利用。