Journal
ORGANIC CHEMISTRY FRONTIERS
Volume 9, Issue 20, Pages 5617-5623Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qo01258h
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Funding
- NSF of China [21572072]
- Xiamen Southern Oceanographic Center [15PYY052SF01]
- 111 project [BC2018061]
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An efficient method for the synthesis of 6-alkenylindazolo[3,2-a]isoquinolines via rhodium(iii)-catalysed C-H bond activation/subsequent [4 + 2] cyclization has been developed. The obtained products exhibited excellent regioselectivity and fluorescence properties, making them suitable for DNA staining and labeling of zebrafish larvae yolk.
An efficient method for the synthesis of 6-alkenylindazolo[3,2-a]isoquinolines via rhodium(iii)-catalysed C-H bond activation/subsequent [4 + 2] cyclization starting from easily available 3-aryl-1-H-indazoles and propargyl alcohols has been developed. A series of 6-alkenylpolycyclic aza-aromatics were obtained in up to 86% yields with broad functional group tolerance and excellent regioselectivity. Furthermore, the title products exhibited robust DNA staining patterns in agarose gel electrophoresis and were able to label the yolk of zebrafish larvae. Coupled with the favourable fluorescence properties of the products, this strategy might provide a novel way to synthesize conjugated pi-system polyheteroarenes with potential utility in various functional materials and fluorescence staining applications.
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