203629-49-6Relevant articles and documents
The directed lithiation of some 3-acylchromone acetals
Daia, G. Elena,Gabbutt, Christopher D.,Hepworth, John D.,Heron, B. Mark,Hibbs, David E.,Hursthouse, Michael B.
, p. 1215 - 1218 (1998)
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.