Transition-metal-free, visible-light induced cyclization of arylsulfonyl chlorides with 2-isocyanobiphenyls to produce phenanthridines
作者:Lijun Gu、Cheng Jin、Jiyan Liu、Hongyan Ding、Baomin Fan
DOI:10.1039/c4cc01487a
日期:——
A visible-light promoted transformation of 2-isocyanobiphenyls and arylsulfonyl chlorides for the synthesis of phenanthridines under oxidant-free and transition-metal-free conditions was described.
2-异氰基联苯和芳基磺酰氯在无氧化剂和过渡金属的条件下,经可见光促进转化合成菲啰啉。
Preparation of Substituted Phenanthridines from the Coupling of Aryldiazonium Salts with Nitriles: A Metal Free Approach
作者:Mani Ramanathan、Shiuh-Tzung Liu
DOI:10.1021/acs.joc.5b00579
日期:2015.5.15
A transition metal free approach for the synthesis of substituted phenanthridines from the coupling reaction of aryldiazonium tetrafluoroborates with nitriles has been developed. This operationally simple protocol proceeds through a substitution of aryldiazonium with nitriles followed by an intramolecular arylation to provide the corresponding phenanthridines in moderate to excellent yields.
Where HAS you been? A manganese‐mediated annulation of 2‐isocyanobiaryls with organoboronic acids is developed for the synthesis of a broad range of phenanthridinederivatives (see scheme). Mechanistic studies indicate that the reaction proceeds by the intramolecular homolytic aromatic substitution (HAS) of an imidoyl radical intermediate.
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.
was proposed based on experimental data and spectrum techniques. Our work also demonstrates application in developing COFs-based photocatalysts for the photocatalytic cyclization of bioactive PAHs derivatives. Graphical abstract