Deuteration as a General Strategy to Enhance Azobenzene‐Based Photopharmacology
摘要:
Chemical photoswitches have become a widely used approach for the remote control of biological functions with spatiotemporal precision. Several molecular scaffolds have been implemented to improve photoswitch characteristics, ranging from the nature of the photoswitch itself (e.g. azobenzenes, dithienylethenes, hemithioindigo) to fine‐tuning of aromatic units and substituents. Herein, we present deuterated azobenzene photoswitches as a general means of enhancing the performance of photopharmacological molecules. Deuteration can improve azobenzene performance in terms of light sensitivity (higher molar extinction coefficient), photoswitch efficiency (higher photoisomerization quantum yield), and photoswitch kinetics (faster macroscopic rate of photoisomerization) with minimal alteration to the underlying structure of the photopharmacological ligand. We report synthesized deuterated azobenzene‐based ligands for the optimized optical control of ion channel and G protein‐coupled receptor (GPCR) function in live cells, setting the stage for the straightforward, widespread adoption of this approach.
Rhodium(III)-Catalyzed Synthesis of Cinnolinium Salts from Azobenzenes and Diazo Compounds
作者:Xiaohong Chen、Guangfan Zheng、Guoyong Song、Xingwei Li
DOI:10.1002/adsc.201800326
日期:2018.8.6
A Rh(III)‐catalyzed C−H activation of azobenzenes in the coupling with diazo compounds has been realized, providing a straightforward strategy to access functionalized cinnolinium triflates in high yields. This protocol features silver free mild reaction conditions and compatibility with diverse functional groups. The coupling proceeds via initial Rh(III)‐catalyzed C−H alkylation, followed by zinc
Rhenium-catalyzed C–H aminocarbonylation of azobenzenes with isocyanates
作者:Xiaoyu Geng、Congyang Wang
DOI:10.1039/c5ob01121c
日期:——
The first C–H aminocarbonylation of azobenzenes with isocyanates is achieved by using rhenium-catalysis, which provides an atom-economical access to o-azobenzamides.
<i>ortho</i>-Heteroarylation of Azobenzenes by Rh-Catalyzed Cross-Dehydrogenative Coupling: An Approach to Conjugated Biaryls
作者:Hong Deng、Hongji Li、Lei Wang
DOI:10.1021/acs.orglett.6b01277
日期:2016.7.1
A direct cross-dehydrogenative coupling strategy for ortho-C–H activation and functionalization of azobenzenes with heteroarenes in the presence of a Rh catalyst was developed. Excellent regioselectivity was achieved by azo-coordinated Rh to realize oxidative C–H/C–H cross-coupling, providing a series of π-conjugated biaryls in good yields.
Cp*Co(III)-catalyzed C–H amidation of azobenzene with dioxazolones has been developed. The amidation reaction does not require external oxidants and gives carbondioxide as the only by-product. Both symmetrical and unsymmetrical azobenzenes were found to undergo amidation smoothly with broad functional group tolerance.
Site-Selective C-H Amidation of Azobenzenes with Dioxazolones under Rhodium Catalysis
作者:Neeraj Kumar Mishra、Yongguk Oh、Mijin Jeon、Sangil Han、Satyasheel Sharma、Sang Hoon Han、Sung Hee Um、In Su Kim
DOI:10.1002/ejoc.201601096
日期:2016.10
The rhodium(III)-catalyzed amidation reaction of azobenzenes with dioxazolones is described. This strategy allows the facile and efficient construction of highly substituted ortho-amidated azobenzenes via direct C-H cleavage approach. A range of substrate scope, excellent levels of chemoselectivity as well as high functional group tolerance were observed. In addition, this protocol was used to generate