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Beilstein J. Org. Chem. 2016, 12, 2503–2510, doi:10.3762/bjoc.12.245
Graphical Abstract
Figure 1: Sydnone-pyrroloazines hybrids 1, indolizine (2), sydnone 3, indolizines attached directly to C-4 of...
Scheme 1: Synthesis of pyridinium bromides 8 and sydnone-indolizine hybrids 9 through the Chichibabin reactio...
Figure 2: The molecular structure of 9d with thermal ellipsoids drawn at the 50% probability level. (a) Inver...
Figure 3: Centrosymmetric C–H···O hydrogen bonded dimeric motif in the crystal of 9d.
Scheme 2: The synthesis and mechanism of formation of sydnone-indolizines 12.
Figure 4: Molecular structure of 12c with atoms represented as thermal ellipsoids at the 50% probability leve...
Figure 5: Intramolecular distortion in 12c.