AMINO ACID APPROACH AS A GENERAL ROUTE TO NONSTABILIZED AZOMETHINE YLIDES. FACILE GENERATION OF PARENT METHANIMINIUM METHYLIDE AND ITS 1-MONO- AND 1,1-DISUBSTITUTED DERIVATIVES
condensation of glycine or N-substituted glycines with a variety of carbonyl compounds such as formaldehyde, aromatic aldehyde, or ketones is a convenient and generalroute to parent methaniminium methylide and its 1-mono- and 1,1-disubstituted derivatives with or without an N-substituent.