期刊
ORGANIC CHEMISTRY FRONTIERS
卷 9, 期 8, 页码 2181-2186出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qo00144f
关键词
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资金
- National Natural Science Foundation of China [21901045, 21901258]
- Foundation of South-Central University of Nationalities [YZZ19003]
A catalytic system-controlled divergent strategy has been developed for the precise synthesis of cinnolines and pyrazolo[1,2-a]cinnolines. This reaction exhibits remarkable features including simple operation, broad scope, and switchable fused N-heterocycle synthesis.
A catalytic system-controlled divergent strategy is developed for the precise synthesis of cinnolines and pyrazolo[1,2-a]cinnolines via the rhodium-catalysed [4 + 2] cyclization of readily available pyrazolidinones and iodonium ylides. A range of cinnolines were obtained in useful to good yields by employing HFIP as the solvent, while the combination of DCE and an organic base selectively delivered pyrazolo[1,2-a]cinnoline frameworks. The remarkable features of this reaction include simple operation, broad scope and switchable fused N-heterocycle synthesis. Mechanistic studies indicated a plausible C-H bond activation/intramolecular cyclisation/aromatization cascade pathway.
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