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A general method for the metal-free, regioselective, remote C–H halogenation of 8-substituted quinolines†
Chemical Science ( IF 7.6 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1039/c7sc04107a Damoder Reddy Motati 1, 2, 3, 4, 5 , Dilipkumar Uredi 1, 2, 3, 4, 5 , E. Blake Watkins 1, 2, 3, 4, 5
Chemical Science ( IF 7.6 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1039/c7sc04107a Damoder Reddy Motati 1, 2, 3, 4, 5 , Dilipkumar Uredi 1, 2, 3, 4, 5 , E. Blake Watkins 1, 2, 3, 4, 5
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An operationally simple and metal-free protocol for geometrically inaccessible C5–H halogenation of a range of 8-substituted quinoline derivatives has been established. The reaction proceeds under air, with inexpensive and atom economical trihaloisocyanuric acid as a halogen source (only 0.36 equiv.), at room temperature. Exceptionally high generality with respect to quinoline is observed, and in most instances, the reaction proceeded with complete regioselectivity. Quinoline with a variety of substituents at the 8-position gave, exclusively, the C5-halogenated product in good to excellent yields. Phosphoramidates, tertiary amides, N-alkyl/N,N-dialkyl, and urea derivatives of quinolin-8-amine as well as alkoxy quinolines were halogenated at the C5-position via remote functionalization for the first time. This methodology provides a highly economical route to halogenated quinolines with excellent functional group tolerance, thus providing a good complement to existing remote functionalization methods of quinolin-8-amide derivatives and broadening the field of remote functionalization. The utility of the method is further showcased through the synthesis of several compounds of biological and pharmaceutical interest.
中文翻译：
对8取代的喹啉进行无金属，区域选择性，远程C–H卤化的通用方法†
已经建立了一种操作简单且无金属的方案，用于一系列8取代的喹啉衍生物的几何上C5–H卤化。该反应在室温下在空气中进行，用廉价且原子经济的三卤代异氰尿酸作为卤素源（仅0.36当量）。在喹啉方面观察到异常高的通用性，并且在大多数情况下，反应以完全的区域选择性进行。在8位上具有各种取代基的喹啉仅以良好或优异的收率得到了C5卤代产物。氨基磷酸酯，叔酰胺，ñ -烷基/ Ñ，Ñ喹啉-8-胺，以及烷氧基喹啉的二烷基，和脲衍生物在C5位上被卤代第一次通过远程功能化。该方法为具有优异的官能团耐受性的卤代喹啉提供了一种非常经济的途径，从而为现有的喹啉-8-酰胺衍生物的远程官能化方法提供了很好的补充，并拓宽了远程官能化的领域。通过合成几种具有生物学和药学意义的化合物，进一步展示了该方法的实用性。
更新日期：2018-01-05
中文翻译：
对8取代的喹啉进行无金属，区域选择性，远程C–H卤化的通用方法†
已经建立了一种操作简单且无金属的方案，用于一系列8取代的喹啉衍生物的几何上C5–H卤化。该反应在室温下在空气中进行，用廉价且原子经济的三卤代异氰尿酸作为卤素源（仅0.36当量）。在喹啉方面观察到异常高的通用性，并且在大多数情况下，反应以完全的区域选择性进行。在8位上具有各种取代基的喹啉仅以良好或优异的收率得到了C5卤代产物。氨基磷酸酯，叔酰胺，ñ -烷基/ Ñ，Ñ喹啉-8-胺，以及烷氧基喹啉的二烷基，和脲衍生物在C5位上被卤代第一次通过远程功能化。该方法为具有优异的官能团耐受性的卤代喹啉提供了一种非常经济的途径，从而为现有的喹啉-8-酰胺衍生物的远程官能化方法提供了很好的补充，并拓宽了远程官能化的领域。通过合成几种具有生物学和药学意义的化合物，进一步展示了该方法的实用性。
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