Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 72, Issue 6, Pages 2236-2239Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo062391r
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Indazolium-3-amidates (X-ray analysis), readily available on trapping the N-heterocyclic carbene indazol-3-ylidene with isocyanates, underwent [3 + 2]-cycloadditions with activated triple bonds to spiro[indazole-3,3'-pyrroles]. A combination of NMR techniques such as heteronuclear single quantum coherence (HSQC), heteronuclear multiple bond correlation (HMBC), nuclear Overhauser enhancement spectroscopy (NOESY), and H-1/N-15 correlations were applied to elucidate the structures of the cycloadducts.
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