α-Methylene-β-lactams 3 were synthesized from the various 2-bromoallylamine derivatives 2 using a catalytic amount of Pd (OAc) 2 or PD (acac) 2 and PPh3, under 1–4 atom pressure of CO in good yields. Similarly, α-alkylidene-β-lactams 20 were synthesized from 3-alkyl-2- bromoallylamines 19, which were easily prepared from the olefins 14, in the same manner.
