该研究报道了通过电化学反应无催化剂合成6-芳基菲啶和酰胺。通过阴极还原由苯胺和亚硝酸烷基酯形成的原位形成的重氮离子进行偶联反应。由异氰酸酯偶联生成的芳基自由基重氮鎓离子以良好的收率提供了所需的产物。该级联反应在室温下以n Bu 4 NBF 4作为电解质在配备有RVC作为阳极且Pt作为阴极的不分隔电池中进行。还进行了一系列详细的机理研究,包括自由基时钟实验和循环伏安法分析。
is presented. In the presence of Pd(PPh3)4, accessible precursors undergo a Suzuki cross-coupling reaction with 2-(Boc-amino)benzeneboronic acid pinacol ester and then spontaneously undergo deprotection and intramolecular condensation to form the corresponding phenanthridines in one step. This reaction has a wide range of substrates with various functional groups, and the corresponding products have
PhI(OAc)<sub>2</sub>–BF<sub>3</sub>–OEt<sub>2</sub>mediated domino imine activation, intramolecular C–C bond formation and β-elimination: new approach for the synthesis of fluorenones, xanthones and phenanthridines
作者:Satinath Sarkar、Narender Tadigoppula
DOI:10.1039/c4ra06159d
日期:——
PhI(OAc)2âBF3âOEt2 mediated domino synthesis of biologically important fluorenones, xanthones and phenanthridines has been developed. The reaction proceeds through imine activation, intramolecular CâC bond formation and β-elimination.
Base‐Promoted Aerobic Oxidation/Homolytic Aromatic Substitution Cascade toward the Synthesis of Phenanthridines
作者:Debabrata Maiti、Atreyee Halder、Suman De Sarkar
DOI:10.1002/adsc.201900995
日期:2019.11.5
transition metal‐free synthesis of polysubstituted phenanthridines from abundant starting materials like benzhydrol and 2‐iodoaniline derivatives. The reaction involves sequential oxidation of alcohol and direct condensation reaction with the amine resulting in a C−N bond formation followed by a radical C−C coupling in a cascade sequence. The used base potassium tert‐butoxide plays a dual role in dehydrogenation
A metal-free radical oxidative decarboxylation/cyclization of acyl peroxides and 2-isocyanobiphenyls was achieved, leading to 6-aryl phenanthridines as well as 6-alkyl phenanthridines in moderate to good yields. The procedure featured simple conditions and was metal-free and base free. It represents a practical approach to access 6-aryl/alkyl phenanthridines.