Ligand-free Iron(II)-Catalyzed N-Alkylation of Hindered Secondary Arylamines with Non-activated Secondary and Primary Alcohols <i>via</i>
a Carbocationic Pathway
作者:Onkar S. Nayal、Maheshwar S. Thakur、Manoranjan Kumar、Neeraj Kumar、Sushil K. Maurya
DOI:10.1002/adsc.201701183
日期:2018.2.15
Secondary benzylic alcohols represent a challenging class of substrates for N‐alkylation of amines. Herein, we describe an iron(II)‐catalyzed eco‐friendly protocol for N‐alkylation of secondary arylamines with secondary benzyl alcohols through a carbocationic pathway instead of the known borrowing hydrogen transfer (BHT) approach. Transiently generated carbocations, produced from alcohols via self‐condensation
仲苄醇代表胺N-烷基化的一类具有挑战性的底物。本文中,我们描述了一种铁(II)催化的生态友好方案,用于通过碳阳离子途径而不是已知的借位氢转移(BHT)方法,将仲芳基胺与仲苄醇进行N-烷基化。由醇通过自缩合反应产生的瞬态碳正离子与芳基胺偶合,以提供高度官能化的胺产物。该方法的范围涉及伯,仲和杂环胺与伯/仲苄基,烯丙基和杂环醇的N-烷基化,这是许多药物中常见的关键结构。该方法也可以容易地用于各种天然产物的胺化。