Journal
ORGANIC LETTERS
Volume 13, Issue 13, Pages 3384-3387Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol201139w
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Funding
- National Natural Science Foundation of China [20772124, 20972157]
- 973 Program [2009CB825300]
- Natural Science Foundation of Liaoning Province [20102225]
- CAS [DICP K2009D04]
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The highly regioselective [3 + 2] cycloaddition of azomethine imines to 1-alkynyl Fischer carbene complexes has been successfully realized under mild conditions. Oxidative demetalation of the newly formed pyrazolo-pyrazolone carbene complexes with pyridine-N-oxide or ceric ammonium nitrate efficiently afforded pyrazolo-pyrazolone derivatives as well as cycloprop-2-enone and trisubstituted 1H-pyrazoles in some cases, providing a novel route to versatile functionalized N,N-bicyclic pyrazolidin-3-ones.
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