Two Approaches toward the Formal Total Synthesis of Oseltamivir Phosphate (Tamiflu): Catalytic Enantioselective Three-Component Reaction Strategy and l-Glutamic Acid Str

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• 作者：Kaliyamoorthy Alagiri ; Makoto Furutachi ; Kenzo Yamatsugu ; Naoya Kumagai ; Takumi Watanabe ; Masakatsu Shibasaki
• 刊名：The Journal of Organic Chemistry
• 出版年：2013
• 出版时间：April 19, 2013
• 年：2013
• 卷：78
• 期：8
• 页码：4019-4026
• 全文大小：341K
• 年卷期：v.78,no.8(April 19, 2013)
• ISSN：1520-6904

文摘

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 纬-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鈥檚 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.