Cz. Ding et Av. Miller, SYNTHESIS OF YDROXY-2,2-DIMETHYL-2H-1-BENZOPYRAN-6-CARBONITRILE DERIVATIVES VIA AN UNUSUAL 1,4-OXYGEN TO NITROGEN HETEROARYL MIGRATION, Tetrahedron letters, 37(26), 1996, pp. 4447-4450
Various heteroaryls were found to undergo 1,4-oxygen to nitrogen migra
tion (e.g. 4-->1) under acidic conditions. This unprecedented migratio
n provides a convenient access to ydroxy-2,2-dimethyl-2H-1-benzopyran-
6-carbonitrile derivatives, which are otherwise difficult to prepare.
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