A new protocol for the Baylis–Hillman reaction: the reaction of iminium salts prepared in situ with methyl acrylate

In situ prepared iminium salts are very effective electrophiles in Baylis–Hillman reactions and react with methyl acrylate in the presence of a catalytic amount of a tertiary amine at ambient temperatures to afford the corresponding Baylis–Hillman adducts. The product undergoes conjugated addition with (trimethylsilyl)dialkylamines to give the diamine 5 in good yields.