On the Inherent Instability of α-Amino α‘-Fluoro Ketones. Evidence for Their Transformation to Reactive Oxyvinyliminium Ion Intermediates
作者:Andrew G. Myers、Joseph K. Barbay
DOI:10.1021/ol006931x
日期:2001.2.1
are shown to be inherently unstable intermediates. Evidence is presented that they undergo enolization toward the amino group followed by expulsion of fluoride ion, forming a proposed oxyvinyliminium ion (amino-substituted oxyallyl cation). In protic, nucleophilic media the proposed intermediate is trapped by solvent. In the presence of a reactive diene, [4 + 3] cycloadducts have been isolated. Prior