
Tetrahedron Letters p. 1215 - 1218 (1998)
Update date:2022-08-03
Topics:
Daia, G. Elena
Gabbutt, Christopher D.
Hepworth, John D.
Heron, B. Mark
Hibbs, David E.
Hursthouse, Michael B.
3-Acylchromone acetals are lithiated at C-2. Subsequent electrophilic trapping gives chromones 4 together with a ring-contracted dimer 6. During the formation of some acetals, an acid-catalysed rearrangement to a 2-substituted 3-formylchromone acetal is observed.
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