Intermolecular Asymmetric Carboesterification of Alkenes by Using Chiral Amine Auxiliaries under O<sub>2</sub>: Synthesis of Enantioenriched α-Methylene-γ-Lactones through Chloropalladation of Alkynes
作者:Zhenming Zhang、Wanqing Wu、Jianhua Liao、Jianxiao Li、Huanfeng Jiang
DOI:10.1002/chem.201500397
日期:2015.4.27
Herein, the first example of chloropalladation‐initiated asymmetric intermolecular carboesterification of alkenes with alkynes by using chiral amine auxiliaries is reported. The use of (1S,2S)‐N1,N1‐dimethylcyclohexane‐1,2‐diamine auxiliaries is essential for providing α‐methylene‐γ‐lactones products in moderate to high yields and excellent enantioselectivities at room temperature. Moreover, the chiral
在本文中,报道了通过使用手性胺助剂进行的由氯palladation引发的烯烃与炔烃的烯烃不对称分子间碳酯化的第一个例子。使用(1 S,2 S)-N 1,N 1-二甲基环己烷-1,2-二胺助剂对提供α-亚甲基-γ-内酯产品在室温下具有中等至高收率和出色的对映选择性至关重要。而且,手性胺助剂可以在反应过程中通过水解容易地除去,以保持绝对构型。这种由氧和水促进的不对称反应为研究晕轮反应中的不对称过程打开了一个新窗口。