Preparation of 4-Allylisoindoline via a Kumada Coupling with Allylmagnesium Chloride
摘要:
A practical, cost-effective Kumada coupling for the preparation of 4-allylisoindoline has been developed. The first catalyst screen for this reaction with allylmagnesium reagents is described. The challenges associated with product isomerization have been minimized by a thorough understanding of the reaction parameters. Additionally, a novel workup protocol has been developed to render Mg salts soluble in aqueous media at pH 10.
Synthesis of the HCV Protease Inhibitor Vaniprevir (MK-7009) Using Ring-Closing Metathesis Strategy
作者:Jongrock Kong、Cheng-yi Chen、Jaume Balsells-Padros、Yang Cao、Robert F. Dunn、Sarah J. Dolman、Jacob Janey、Hongmei Li、Michael J. Zacuto
DOI:10.1021/jo3001595
日期:2012.4.20
A highly efficient synthesis of Vaniprevir (MK-7009) has been accomplished in nine linear steps and 55% overall yield. The key features of this synthesis include a cost-effective synthesis of the isoindoline subunit and efficient construction of the 20-membered macrocyclic core of Vaniprevir (MK-7009) utilizing ring-closing metathesis technology. A high-performing ring-closing metathesis protocol has been achieved by simultaneous slow addition of the ruthenium catalyst (0.2 mol %) and the diene substrate at a concentration of 0.13 M.