Copper-catalysed intramolecular O-arylation: a simple and efficient method for benzoxazole synthesis
作者:Fengtian Wu、Jie Zhang、Qianbing Wei、Ping Liu、Jianwei Xie、Haojie Jiang、Bin Dai
DOI:10.1039/c4ob02068e
日期:——
An efficient protocol has been developed for the copper-catalysed intramolecular cyclization of N-(2-iodo-/bromo-/chloro-phenyl)benzamides for the synthesis of 2-substituted benzoxazoles.
Radical cyclization of o-iodophenylacrylamides afforded indolin-2-ones in good yields.
将o-碘苯乙烯酰胺进行基团环化反应,得到了良好产率的吲哚-2-酮。
Lewis Acid Catalyzed Atom-Economic Synthesis of C2-Substituted Indoles from <i>o</i>-Amido Alkynols
作者:Amol Milind Garkhedkar、Babasaheb Sopan Gore、Wan-Ping Hu、Jeh-Jeng Wang
DOI:10.1021/acs.orglett.0c00971
日期:2020.5.1
Herein we have disclosed a Zn(OTf)2 catalyzed synthesis of C2-alkyl substituted indole derivatives via unprecedented carbonyl group migration from o-amido alkynols. The key features of this protocol involve N,O-carbonyl group migration, broad substrate scope with varied functionality tolerance, moderate to good yields, and 100% atom economy. The crossover experiments proved that the migration is happening