The sydnone ring as an ortho-director of lithiation. Dilithiation of 3-phenylsydnone and trapping by electrophiles
作者:Kenneth Turnbull、Douglas M. Krein
DOI:10.1016/s0040-4039(97)00015-4
日期:1997.2
Readily available 3-phenylsydnone (3) reacts with n-butyllithium/TMEDA to form the dilithio species 4 which can be trapped with suitable electrophiles. This represents the first use of a mesoionic ring system for directed lithiation. (C) 1997, Elsevier Science Ltd.