Transition metal-free catalytic reduction of primary amides using an abnormal NHC based potassium complex: integrating nucleophilicity with Lewis acidic activation
作者:Mrinal Bhunia、Sumeet Ranjan Sahoo、Arpan Das、Jasimuddin Ahmed、Sreejyothi P.、Swadhin K. Mandal
DOI:10.1039/c9sc05953a
日期:——
potassium complex was used as a transitionmetal-free catalyst for reduction of primary amides to corresponding primary amines under ambient conditions. Only 2 mol% loading of the catalyst exhibits a broad substrate scope including aromatic, aliphatic and heterocyclic primary amides with excellent functional group tolerance. This method was applicable for reduction of chiral amides and utilized for the synthesis
Primary amides to amines or nitriles: a dual role by a single catalyst
作者:Hari S. Das、Shyamal Das、Kartick Dey、Bhagat Singh、Rahul K. Haridasan、Arpan Das、Jasimuddin Ahmed、Swadhin K. Mandal
DOI:10.1039/c9cc05856g
日期:——
of various primary amides to amines (25 examples). On simple modification of the reaction conditions such as in the presence of a catalytic amount of secondary amide, the same catalyst can transform the primary amides into intermediate nitrile compounds (16 examples) in excellent yields. This is the first example where such a controlled catalytic transformation of primary amides to amines or nitriles
Silylative reduction of nitriles was studied under transition metal-free conditions by using B(C6F5)3 as a catalyst with hydrosilanes as a reductant. Alkyl and (hetero)aryl nitriles were efficiently converted to primaryamines or imines under mild conditions. The choice of silanes was found to determine the selectivity: while a full reduction of nitriles was highly facile, the use of sterically bulky
在无过渡金属的条件下,通过使用B(C 6 F 5)3作为催化剂,以氢硅烷作为还原剂,研究了腈的甲硅烷基化还原反应。在温和的条件下,烷基和(杂)芳基腈被有效地转化为伯胺或亚胺。发现硅烷的选择决定了选择性:虽然腈的完全还原非常容易,但是使用空间大体积的硅烷允许部分还原,从而生成N-甲硅烷基亚胺。
Reduction of Amides to Amines with Pinacolborane Catalyzed by Heterogeneous Lanthanum Catalyst La(CH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub>-<i>o</i>)<sub>3</sub>@SBA-15
作者:Chenjun Guo、Fangcao Zhang、Chong Yu、Yunjie Luo
DOI:10.1021/acs.inorgchem.1c01531
日期:2021.9.6
Hydroboration of amides is a useful synthetic strategy to access the corresponding amines. In this contribution, it was found that the supported lanthanum benzyl material La(CH2C6H4NMe2-o)3@SBA-15 was highly active for the hydroboration of primary, secondary, and tertiary amides to amines with pinacolborane. These reactions selectively produced target amines and showed good tolerance for functional
酰胺的硼氢化是获得相应胺的有用合成策略。在该贡献中,发现负载的镧苄基材料 La(CH 2 C 6 H 4 NMe 2 - o ) 3 @SBA-15 对伯、仲和叔酰胺与频哪醇硼烷硼氢化成胺具有高度活性。这些反应选择性地产生目标胺,并显示出对 -NO 2等官能团的良好耐受性、-卤素和-CN,以及S和O等杂原子。这种还原过程表现出多相催化剂的可回收和可重复使用的特性,适用于克级合成。反应机理是基于一些控制实验和以前的文献提出的。这是由多相催化剂介导的酰胺硼氢化还原为胺的第一个例子。