Boroquinol Complexes with Fused Extended Aromatic Backbones: Synthesis and Optical Properties
作者:Sven M. Elbert、Philippe Wagner、Thines Kanagasundaram、Frank Rominger、Michael Mastalerz
DOI:10.1002/chem.201604421
日期:2017.1.18
Boron‐based dyes are attractive synthetic targets due to their large variability of absorption and emission wavelengths. Through Pictet–Spenglercyclizations, followed by oxidation, π‐extended boroquinols have been synthesized. During optimization of the reaction conditions, an unusual dearylation has been found and mechanistically investigated. For two of the synthesized boroquinols, mechanochromic
A new and mild synthetic approach for the synthesis of 6-unsubstituted phenanthridine and phenanthridine-like compounds under metal-free conditions at room temperature has been developed. The strategy involved a tandem azide rearrangement/intramolecular annulation and oxidation reactions of biarylmethyl azide precursors to obtain the desired products in up to 99% yields with high regioselectivity.
Photocyclization synthesis of phenanthridine and its derivatives under direct dehydrogenation conditions
作者:Wen-Qing Zhu、Jin Zhang、Pan Fan、Lan-Ting Shi、Hong Li、Min-Ge Yang、Yang Li
DOI:10.1016/j.tetlet.2020.152734
日期:2021.2
synthesizing phenanthridines by photocyclization has been established. This method does not require inert gas protection, does not require transition metal catalysts and is environmentally friendly, efficient and convenient. It is proposed to use (E)-N,1-diphenylformimines as substrates to synthesize phenanthridine and its derivatives by ultraviolet light, which provides a new synthesis route for further research
Synthesis of Phenanthridines through Iodine-Supported Intramolecular C–H Amination and Oxidation under Visible Light
作者:Yan Gao、Yi Jing、Lixin Li、Jie Zhang、Xuenian Chen、Yan-Na Ma
DOI:10.1021/acs.joc.0c01390
日期:2020.10.2
Herein, we report a metal-free and step-economic synthesis of phenanthridines from 2-biarylmethanamines under mild conditions. The reaction involves iodine-supported intramolecular C–H amination and oxidation of 5,6-dihydrophenanthridine under air and benign visible light. The mechanism study reveals that visible light plays a key role in both these steps.
annulation between 2-aminobiphenyls and activated olefins is disclosed for succinct synthesis of valuable phenanthridine scaffolds. The protocol avails a common organic functional group, free amine, as a directing group and represents a unique combination of C–Hactivation/annulation/C–C bond cleavage cascade that bodes well in the production of bioactive alkaloids including trisphaeridine and bicolorine