Lewis Acid-mediated Ring Expansion Reaction of Benzo[b]cyclopropa[e]pyran-7-ol Acetates: Facile Synthesis of 2-Alkyl Substituted 2,3-Dihydro-1-benzoxepins
摘要:
In the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf), benzo[b]cyclopropa[e]pyran-7-ol acetates easily reacted with silyl enol ethers to give 2-alkyl substituted 2,3-dihydro-1-benzoxepin derivatives in good yields.