Simple Generation of Nonstabilized Azomethine Ylides through Decarboxylative Condensation of α-Amino Acids with Carbonyl Compounds via 5-Oxazolidinone Intermediates
Heating α-amino acids with a variety of carbonyl compounds generates N-unsubstituted or N-substituted azomethine ylides of nonstabilized types through the elimination of water and carbon dioxide. The ylides are captured by olefinic, acetylenic, and carbonyl dipolarophiles producing pyrrolidines, pyrrolines, and oxazolidines. The reaction involves intermediary 5-oxazolidinones which can be sometimes
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.
2,5-Unsubstituted pyrrolidines from formaldehyde and amino acids through in situ azomethine-ylide 1,3-dipolar cycloaddition to alkenes
作者:Marc Joucla、Jacques Mortier
DOI:10.1039/c39850001566
日期:——
Formaldehyde and α-amino acids such as sarcosine and glycine react with alkenes to give N-Me and N-H Pyrrolidines via in situ generated azomethine-yields.