Synthesis of 2,3-benzoxepins by sequential cyclopropanation/ring-enlargement reactions of benzopyrylium triflates with diazoesters
作者:Sven Rotzoll、Bettina Appel、Peter Langer
DOI:10.1016/j.tetlet.2005.04.009
日期:2005.6
Functionalized 2,3-benzoxepins were prepared by cyclopropanation of benzopyrylium triflates with diazoesters and subsequent TFA-mediated ring enlargement.