Regiochemistry of the microwave-assisted reaction between aromatic amines and α-bromoketones to yield substituted 1H-indoles
作者:Yosu Vara、Eneko Aldaba、Ana Arrieta、José L. Pizarro、María I. Arriortua、Fernando P. Cossío
DOI:10.1039/b719641e
日期:——
Bischler (or Bischler-Mohlau) reaction between aromaticamines and alpha-bromoketones has been studied by computational and experimental techniques. It has been found that in many cases the reaction yields are improved under microwave irradiation and working in the absence of solvent. When di- and trisubstituted amines are used as substrates the regioselectivity of the reaction is different to that obtained
Synthesis of fused indoline heterocycles via dearomatization of indoles with α-bromohydrazones: a systematic study on the substrates
作者:Wen-Bin Cao、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1039/c6ob02362b
日期:——
An efficient metal-free dearomatization of indoles with α-bromohydrazones is reported. Various fused indoline heterocycles, which are potentially biologically active, were achieved in good yields (up to 94%) under mild conditions. A systematic study on electronic- and steric effects of substrate and reagents revealed that they have great influence upon the reaction. Based on this, the scope of indoles
An efficient cobalt(III)‐catalyzed intramolecular cross‐dehydrogenative C−H/N−H coupling of ortho‐alkenylanilines has been developed utilizing O2 as a terminal oxidant. The developed reaction tolerates various reactive functional groups and allows the synthesis of diverse indole derivatives in good to excellent yields. The method was successfully extended to the synthesis of benzofurans through the
Despite significant advances made on the synthesis of indole derivatives through photochemical strategies during the past several years, the requirement of equivalent amounts of oxidants, bases or other additional additives has limited their practical applications in the synthesis of natural products and pharmaceuticals as environment-friendly processes. Herein, we report LED visible-light-induced
尽管在过去几年中通过光化学策略合成吲哚衍生物取得了重大进展,但对等量氧化剂、碱或其他添加剂的要求限制了它们在天然产物和药物合成中作为环保工艺的实际应用. 在此,我们报告了 LED 可见光诱导的氧化还原中性脱磺基 C(sp 2 )-H 官能化,在没有任何额外添加剂的情况下,在温和条件下通过 γ-碎裂合成具有广泛范围的N取代吲哚。在氘标记实验、动力学分析、Hammett绘图分析和DFT计算的基础上,研究了反应机理范式。
Copper-mediated intramolecular aza-Wacker-type cyclization of 2-alkenylanilines toward 3-aryl indoles
A copper-mediatedintramolecular aza-Wacker-type cyclization was developed for the direct and efficient synthesis of 3-aryl indoles using 2-alkenylanilines in moderate to good yields with good functional group compatibility. This strategy shows the high efficiency, operational simplicity as well as broad substrate scope.