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
Electronic effect of substituents on anilines favors 1,4-addition to<i>trans</i>-β-nitrostyrenes: access to<i>N</i>-substituted 3-arylindoles and 3-arylindoles
作者:Radhakrishna Gattu、Suchandra Bhattacharjee、Karuna Mahato、Abu T. Khan
DOI:10.1039/c8ob00736e
日期:——
A simple and an efficient method for the regioselectivesynthesis of N-alkyl/aryl/H 3-arylindole derivatives from N-substituted anilines and trans-β-nitrostyrenes has been described using 10 mol% of bismuth(III) triflate as a catalyst in acetonitrile at 80 °C. The present protocol profits from the formation of new C–C and C–N bonds, broad substrate scope and moderate to good yields.
已经描述了一种简单有效的方法,该方法使用10 mol%的三氟甲磺酸铋(III)作为催化剂,由N-取代的苯胺和反式-β-硝基苯乙烯区域选择性合成N-烷基/芳基/ H 3-芳基吲哚衍生物。乙腈在80°C下进行。本协议受益于新的C–C和C–N键的形成,广泛的底物范围以及中等至良好的收益率。
Synthesis of topologically constrained naphthalimide appended palladium(<scp>ii</scp>)–N-heterocyclic carbene complexes – insights into additive controlled product selectivity
Pd(ii)–NHC catalyzed regioselective heteroannulation of o-haloanilines and arylethynyl-trimethylsilane to yield indoles and additive controlled switchable product selectivity has been demonstrated.
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
An efficient divergent functionalization of N‐alkylated ortho‐alkenylanilines to substituted indoles and quinolines has been accomplished by employing rhodium‐catalyzed cross‐dehydrogenative coupling and silver‐mediated oxidative cyclization, respectively. The developed methods tolerate various functional groups and allow the synthesis of substituted indoles and quinolines in good to excellent yield