3,4-Dihydro-β-carboline afforded after imino Diels-Alder reaction stereoselective alkylation and cyclisation, 14,15-dehydro-17-nor eburnamonine . Catalytic hydrogenation of compound gave rise to a simple product, 2,7-dihydro-17-nor eburnamonine . The configuration of this compound has been secured by a two dimensional NMR study.