Substrate-Regiocontrolled Synthesis of Enantioenriched Allylic Amines by Palladium-Catalysed Asymmetric Allylic Amination: Formal Synthesis of Fagomine
作者:Sébastien Soriano、Margarita Escudero-Casao、M. Isabel Matheu、Yolanda Díaz、Sergio Castillón
DOI:10.1002/adsc.201600583
日期:2016.12.22
or the protected derivative, respectively. Unhindered primary amines can be used as nucleophiles, thus enlarging the scope of the Pd/DACH catalytic system. Hydrogen bonding involving the free hydroxy group in the unprotected allylic carbonate is proposed to be responsible for the control of the regioselectivity to afford branched isomers, obtained in high ee. A short and enantioselective formal synthesis
使用钯/ 1,2-二氨基环己烷(DACH)催化的烯丙基胺化反应,可以分别从未保护的或受保护的衍生物开始,从E -4-羟基丁烯-2-基甲基碳酸酯中获得支链的烯丙基胺或线性胺。不受阻碍的伯胺可用作亲核试剂,因此扩大了Pd / DACH催化体系的范围。有人提出,在未保护的烯丙基碳酸酯中涉及游离羟基的氢键负责控制区域选择性,以提供高ee得到的支链异构体。使用该方法描述了糖苷酶抑制剂fagomine的短而对映选择性的形式合成。