Nucleophilic Aromatic Substitution on 1-Alkoxy-2-naphthoates with 1-Naphthyl Grignard Reagents. A Practical and Convenient Asymmetric Synthesis of 1,1′-Binaphthyl-2-carboxylates
作者:Tetsutaro Hattori、Hiroki Hotta、Takatsugu Suzuki、Sotaro Miyano
DOI:10.1246/bcsj.66.613
日期:1993.2
Grignard reagents efficiently displace the 1-alkoxyl group of 1-alkoxy-2-naphthoic esters to provide an easy access to the corresponding 1,1′-binaphthyl-2-carboxylates in excellent yields; isopropyl ester is bulky enough to prevent the Grignard addition to the ester carbonyl function. High levels of asymmetric induction (up to 98% optical yield) have been achieved in the joining of the two naphthalene rings
1-Naphthyl Grignard 试剂有效取代 1-alkoxy-2-naphthoic 酯的 1-烷氧基,以优异的产率轻松获得相应的 1,1'-binaphthyl-2-carboxylates;异丙酯足够大以防止格氏加成到酯羰基官能团上。通过使用 1-(lp-menth-3-yloxy)-2-naphthoates,在连接两个萘环时实现了高水平的不对称诱导(高达 98% 的光学产率),而手性烷基酯的反应1-甲氧基-2-萘甲酸具有明显到中等的立体选择性。讨论了联萘偶联和不对称诱导的可能反应机制。