The amidine (2) has been prepared in three steps from the enolate of (
3-cyanopyridin-4-yl)acetaldehyde and tryptamine hydrochloride by way o
f the enamine (5) and the 1,2,3,4-tetrahydro-beta-carboline (6). The c
onversion of 2 into nauclefine has been previously reported.