期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 363, 期 2, 页码 525-531出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.202001119
关键词
Oxo-yne; Nitrones; Imines; Oxoaryalation; Indoles; Oxazolidines
资金
- Ministry of Education [MOE 106N506CE1]
- Ministry of Science and Technology, Taiwan [MOST 107-3017-F-007-002]
A gold-catalyzed synthesis method for 1,3-dihydrooxazolo[3,4-a]indoles from 1-oxo-3-yn-4-ols and nitrones is described. The research demonstrates that internal alkynes can undergo oxoarylation reaction with nitrones, revealing the underlying chemical mechanism.
A gold-catalyzed synthesis of 1,3-dihydrooxazolo[3,4-a]indoles from 1-oxo-3-yn-4-ols and nitrones is described; this new bicyclic annulation presents the first examples that internal alkynes can react with nitrones to undergo an oxoarylation route. DFT calculations indicate a [3,3]-sigmatropic shift of initial alkenylgold intermediates to elude the intermediacy of gold carbenes. We also developed new [3+2]-annulations of the same 1-oxo-3-yn-4-ols with imines, yielding oxazolidin-4-ylidene derivatives efficiently. The tethered alcohols of these 1-oxo-3-ynes allow trapping of their metastable 2-azadienium intermediates to enable a novel annulation. Our mechanistic analysis indicates that the two products, despite their structural relevance, are produced from two independent systems.
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