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Communication | Regular issue | Vol 53, No. 6, 2000, pp.1251-1254
Published online, 1st January, 1970
DOI: 10.3987/COM-00-8882
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

Yoshiaki Sugita,* Hiroki Hosoya, and Ichiro Yokoe

*Faculty of Pharmaceutical Sciences, Josai University, Sakado, Saitama 350-0295, Japan


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.