Three-component reaction of alkyl isocyanides with acetylenic esters and pyridine-2-carboxaldoxime or α-furildioxime: Synthesis and dynamic NMR study of ketenimines and bis(ketenimines)

The addition of pyridine-2-carboxaldoxime or α-furildioxime to dialkyl acetylenedicarboxylates under neutral conditions in the presence of alkyl isocyanides leads to ketenimines and bis(ketenimines) in good yields.