期刊
ORGANIC LETTERS
卷 20, 期 17, 页码 5278-5281出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.8b02214
关键词
-
资金
- NSFC [21372256, 21572264]
- Program for Changjiang Scholars and Innovative Research Team [IRT1042]
The copper-catalyzed asymmetric [3 + 3] annulation of ethynyl benzoxazinanones with pyrazolones has been achieved, providing simple access to 1,4-dihydropyrano[2,3-c]pyrazole derivatives in moderate to excellent yields with excellent enantioselectivities (up to 99% ee). Compared with previous annulation reactions of copper-allenylidenes from ethynyl benzoxazinanones, the current reaction fused the three carbon atoms of the propargyl moiety into a heterocyclic framework.
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