Copper(II)-Catalyzed Indolizines Formation Followed by Dehydrogenative Functionalization Cascade to Synthesize 1-Bromoindolizines
作者:Fuyao Wang、Yongmiao Shen、Huayou Hu、Xiangshan Wang、Hui Wu、Yun Liu
DOI:10.1021/jo501626b
日期:2014.10.17
one-pot, three-component cascade reaction between pyridine, α-acylmethylbromide, and maleic anhydride leading to direct access of 1-bromoindolizines in high yields has been developed. This protocol is accomplished via a reaction sequence of 1,3-dipolar cycloaddition of the pyridinium ylide with maleic anhydride, oxidative decarboxylation of the primary cycloadduct, and dehydrogenative bromination of
已经开发了吡啶,α-酰基甲基溴化物和马来酸酐之间的一锅三组分级联反应,该反应导致高产率直接获得1-溴吲哚并二氮杂。该方案是通过吡啶鎓叶立德与马来酸酐的1,3-偶极环加成反应,伯环加合物的氧化脱羧作用以及所得的1-未取代的吲哚嗪的脱氢溴化反应完成的。氯化铜用作催化剂,氧气用作末端氧化剂。该反应代表在C-1位的吲哚嗪碱过渡金属催化的直接脱氢溴化反应的第一个例子。此外,可以通过简单的反应过程将获得的1-溴吲哚并酮转化为其他1-取代的吲哚嗪,例如1-芳基吲哚并嗪。