3-Hydroxypyridine (Ia) and its 6-methyl analogue (Ib) react with the benzyne precursor (IV) to give 1-azabenzoisocoumarins (IIa,b); the latter reaction also yielded 6,7-benzo-5-methyl-8-phenyl-8-azaicyclo[3,2,1]-oct-3-en-2-one (III) as a by-product.
N. Dennis, A. R. Katritzky and S. K. Parton, J. Chem. Soc., Chem. Commun., 1972, 1237 DOI: 10.1039/C39720001237
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