66354-68-5Relevant articles and documents
NBS-assisted palladium-catalyzed bromination/cross-coupling reaction of 2-alkynyl arylazides with KSCN: an efficient method to synthesize 3-thiocyanindoles
Hu, Guiwen,Li, Ping,Zhou, Zhiqiang,Yang, Fan,Xu, Shijie,Fan, Hui,Zhao, Xuechun,Zhang, Xiaoxiang
supporting information, p. 3828 - 3832 (2021/03/06)
A novel and efficient method for the synthesis of 3-thiocyanindoles from 2-alkynyl arylazides with KSCN is described. NBS (N-bromosuccinimide) plays an important role in this cascade bromination/cross-coupling reaction. This reaction provides the 3-thiocy
A new A3B zinc(II)-porphyrin ligand and its ruthenium(II) complex: Synthesis, photophysical properties and photocatalytic applications
Yu, Xiu-yue,Su, Hui,Zheng, Xin,Liu, Wen-bo,He, Yao,Fei, Na-na,Qiao, Ru,Ren, Yun-lai,Niu, Cao-yuan
, (2021/04/19)
Porphyrins and metalloporphyrins (or porphyrin coordination complexes) have been wildly investigated as photocatalysts in recent years. Herein we synthesized two new A3B porphyrins, a new asymmetric A3B zinc-porphyrin ligand with peripheral chelate group (pyridine dicarboxylate), and a ruthenium(II) complex of the porphyrin ligand. Their photo-physical properties were characterized and investigated by UV-Vis and fluorescent emission. The modeling of the molecular structures was optimized by DFT theoretical calculation. All porphyrin compounds exhibited strong absorbance at the Soret bands and Q bands. The free base of porphyrin possessed a higher quantum yield and a longer life time than the other two zinc-porphyrins and ruthenium-porphyrin in terms of fluorescence. Furthermore, the ruthenium-porphyrin complex can be used as a promising photocatalyst under visible light for two kinds of organic reactions: ketone-related oxidative aminothiocyanation (above 90% yield) and indole-related oxidative thiocyanation (around 80% yield) with a remarkable low amount (0.1 mmol %).
Screening metal-free photocatalysts from isomorphic covalent organic frameworks for the C-3 functionalization of indoles
Chen, Xiong,Feng, Xiao,Han, Songjie,Li, Chunzhi,Li, He,Li, Ziping,Liu, Xiaoming,Shao, Pengpeng,Xia, Hong
supporting information, p. 8706 - 8715 (2020/05/16)
The visible-light-driven organic transformation using two-dimensional covalent organic frameworks (2D-COFs) as metal-free heterogeneous photocatalysts is a green and sustainable approach, and it has gained a surge of interest by virtue of the photosensitizer's high crystallinity, abundant porosity, outstanding stability, excellent light-harvesting ability and tunable structure. However, the guiding principle for designing, constructing and selecting COF-based photocatalysts has not been put forward so far. Herein, we contribute a fascinating strategy to guide the acquisition of excellent framework photocatalysts, which is to screen them from a series of isomorphic COFs. As a proof of concept, three new isomorphic pyrene-based 2D-COFs (COF-JLU23, COF-JLU24 and COF-JLU25) with variable linkers were successfully synthesized. In addition to having similar crystallinity and porosity with the same pore size and shape, their absorption, emission, bandgap, energy level, transient photocurrent response and photocatalytic activity could be easily adjustedviaconfiguring different linkers in frameworks. Indeed, COF-JLU24 with electron donor-acceptor characteristics exhibited the best photocatalytic activity among the three isomorphic COFs for C-3 functionalization reactions of indoles, even better than that of the metal-free photocatalyst g-C3N4. More importantly, the screened COF-JLU24 as a metal-free photocatalyst still displayed extensive substrate adaptability and excellent recyclability. We anticipate that this strategy will become a robust rule of thumb for fast access to COF-based photocatalysts. In addition, we still highlight that the present study broadens the applied frontier of COF-based photocatalysts.
