β,γ-Unsaturated α-aminophosphonates: synthesis and reactivity

Vinylogous iminium salts from γ-aminoenamines react with triethylphosphite to afford amino phosphonates in moderate to good yields. The latter are easily converted to α-substituted aminoallylphosphonates that can yield α-substituted aminoallylphosphonates on reaction with butyllitium and a series of electrophiles.