We report a “macrocycle route” toward aliskiren, a drug presently marketed for the treatment of hypertension, using a highly stereocontrolled approach starting from a common “isopropyl chiron”. Highlights of the synthesis include a challenging RCM reaction to produce a nine-membered unsaturated lactone, a highly stereoselective catalytic Du Bois aziridination, and a regio- and diastereoselective aziridine
A detailed account is given describing the approaches used toward the totalsynthesis of aliskiren. In particular, ring-closing metathesis with the Hoveyda–Grubbs catalyst accelerates the formation of a 9-membered lactone from an (R)-ester. The diastereomeric (S)-ester leads to the formation of dimeric dilactones, which were characterized by X-ray analysis and chemical conversions.
The effects of isopropyl substituents and molar concentration of diastereomeric esters toward the formation of nine-membered unsaturatedlactones, in the context of the synthesis of the intermediates of the antihypertensive drug aliskiren, have been studied. The effects of isopropyl substituents and molar concentration of diastereomeric esters toward the formation of nine-membered unsaturated lactones