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Beilstein J. Org. Chem. 2009, 5, No. 66, doi:10.3762/bjoc.5.66
Graphical Abstract
Figure 1: Unsubstituted pyrrolo[1,2-b]pyridazine.
Scheme 1: Reagents and conditions: i) p-TSA (0.5 equiv), toluene/cyclohexane (4:15), reflux, 15–18 h; ii) p-T...
Figure 2: Depiction with proprietary numbering of compound 6a.
Scheme 2: Plausible mechanistic pathway.
Scheme 3: Reagents and conditions: i) p-TSA (1.5 equiv), toluene/cyclohexane (1:1), reflux, 10.0 h.
Scheme 4: Reagents and conditions: i) p-TSA (2.0 equiv), toluene (30.0 volumes).