The directed lithiation of some 3-acylchromone acetals
作者:G.Elena Daia、Christopher D. Gabbutt、John D. Hepworth、B.Mark Heron、David E. Hibbs、Michael B. Hursthouse
DOI:10.1016/s0040-4039(97)10733-x
日期:1998.3
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 someacetals, an acid-catalysed rearrangement to a 2-substituted 3-formylchromone acetal is observed.