An efficient synthesis of 1,3-diaryl-pyrrolo[1,2-a]quinoxalines from 2-(1h-pyrrol-1-yl)phenylamines
摘要:
The condensation of 1,3-diaryl-4-bromo-2-buten-1-ones with o-phenylenediamine leads to 2-[2,4-diaryl-1H-pyrrol-1-yl]phenylamines. Heating solutions of these compounds in formic acid leads to formylation and intramolecular condensation to give 1,3-diarylpyrrolo[1,2-a]quinoxalines. The acylation of 2-[2,4-diphenyl-1H-pyrrol-1-yl]phenylamine with acetic anhydride in acetic acid leads to an acetamide, which readily cyclizes to give 4-methyl-1,3-diphenylpyrrolo[1,2-a]quinoxaline upon heating with POCl(3).
Pd-Catalyzed direct C–H arylation of pyrrolo[1,2-<i>a</i>]quinoxalines
作者:Di Hao、Zhen Yang、Yali Liu、Yang Li、Chuntian Li、Yanlong Gu、Luigi Vaccaro、Jichang Liu、Ping Liu
DOI:10.1039/d1ob02248b
日期:——
An efficient Pd-catalyzed direct C–H arylation of pyrrolo[1,2-a]quinoxalines with aryl iodides is described, providing a selective route toward a series of 1-arylated and 1,3-diarylated pyrrolo[1,2-a]quinoxalines in good yields. This method features a broad substrate scope, good functional group tolerance and gram-scale synthesis. Furthermore, the C3-thiocyanation of the arylated product is also achieved
描述了一种有效的 Pd 催化的吡咯并[1,2- a ]喹喔啉与芳基碘化物的直接 C-H 芳基化反应,为一系列 1-芳基化和 1,3-二芳基化吡咯并[1,2- a ] 喹喔啉的产率很高。该方法具有底物范围广、官能团耐受性好和克级合成的特点。此外,还实现了芳基化产物的 C3-硫氰化。我们相信这些新型芳基取代的吡咯并[1,2- a ]喹喔啉将在有机合成和药物化学中具有多种应用。