title: Two approaches toward the formal total synthesis of oseltamivir phosphate (Tamiflu): catalytic enantioselective three-component reaction strategy and L-glutamic acid strategy.
abstract: Two independent formal total syntheses of oseltamivir phosphate were successfully achieved: the first utilized a copper-catalyzed asymmetric three-component reaction strategy, and the second utilized L-glutamic acid γ-ester as a chiral source to install the correct stereochemistry. Both strategies used Dieckmann condensation to construct a six-membered ring core, after which manipulation of the functional groups and protecting groups accessed Corey's intermediate for the synthesis of oseltamivir phosphate. While the first synthesis was accomplished via four purification steps in 25.7% overall yield, albeit with moderate optical purity (76% ee), the second strategy achieved the synthesis via six purification steps in 19.8% overall yield with perfect enantiocontrol.
authors.affiliation: Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki, Shinagawa-ku, Tokyo 141-0021, Japan.
authors.forename: Kaliyamoorthy
authors.initials: K
authors.lastname: Alagiri
authors.forename: Makoto
authors.initials: M
authors.lastname: Furutachi
authors.forename: Kenzo
authors.initials: K
authors.lastname: Yamatsugu
authors.forename: Naoya
authors.initials: N
authors.lastname: Kumagai
authors.forename: Takumi
authors.initials: T
authors.lastname: Watanabe
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Shibasaki
mesh_terms: D002384:Catalysis; D018698:Glutamic Acid / Q000737:chemistry*; D015394:Molecular Structure; D053139:Oseltamivir / Q000138:chemical synthesis* / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D053139:Oseltamivir; D018698:Glutamic Acid