A scalable synthesis of a potent renin inhibitor (1) is described. The absolute stereochemistry is set via an unprecedented diastereoselective Dieckmann cyclization directed by a remote chiral protecting group. This transformation enables preparation of chiral 1,3-[3.3.1]-diazabicyclononenes by desymmetrization of alkyl-esters, with selectivities ranging from 4 to 17:1.
Merck Frosst, Centre for Therapeutic Research, Department of Process Research, 16711 TransCanada Highway, Kirkland, Que?bec, Canada, H9H 3L1. danny_gauVreau@merck.com