SCHEDULED MAINTENANCE
Routes for the preparation of the four isomeric pyridine analogues of phthalide are described starting from the readily available pyridine 2,3- and 3,4-diacids, or derivatives, and making use of the differential reactivity of substituents at pyridine 2-versus 3- and 3-versus 4-positions.
W. R. Ashcroft, M. G. Beal and J. A. Joule, J. Chem. Soc., Perkin Trans. 1, 1981, 3012 DOI: 10.1039/P19810003012
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