Direct, Enantioselective, and Nickel(II) Catalyzed Reactions of
<i>N</i>
‐Azidoacetyl Thioimides with Trimethyl Orthoformate: A New Combined Methodology for the Rapid Synthesis of Lacosamide and Derivatives
作者:Saul F. Teloxa、Stuart C. D. Kennington、Marc Camats、Pedro Romea、Fèlix Urpí、Gabriel Aullón、Mercè Font‐Bardia
DOI:10.1002/chem.202001057
日期:2020.9.4
3‐thiazolidine‐2‐thione with trimethyl orthoformate catalyzed by Tol‐BINAPNiCl2 in the presence of TESOTf and 2,6‐lutidine is reported. The heterocyclic scaffold can be easily removed by addition of a wide array of amines to give the corresponding enantiomerically pure 2‐azido‐3,3‐dimethoxypropanamides in high yields. Appropriate manipulation of the N‐benzyl amide derivative provides an efficient access to the antiepileptic
据报道,在TESOTf和2,6-二甲基吡啶存在下,N-叠氮基乙酰基-1,3-噻唑烷-2-硫酮与Tol-BINAPNiCl 2催化的原甲酸三甲酯直接和高度对映选择性反应。可以通过添加多种胺轻松去除杂环骨架,从而以高收率得到相应的对映体纯的2-叠氮基-3,3-二甲氧基丙酰胺。通过新的对映选择性C-C键形成过程,对N-苄基酰胺衍生物的适当操作可有效获得抗癫痫药lacosamide。DFT计算研究发现了一些线索,这些线索有助于理解对从原甲酸三甲酯向假定的氧碳鎓中间体添加烯醇镍(II)进行显着立体控制的理解。