据报道,使用N-甲氧基酰胺进行了铜催化的芳基三氟硼酸酯的亲电酰胺化反应。该反应显示出源自两个明显特征的高官能团相容性:1)N-甲氧基酰胺的高稳定性,以及2)在LiCl存在下的非碱性温和条件。所开发的方法还可以用于合成广泛分布于天然产物中的烯酰胺。初步的机理研究表明,第一步是在LiCl的协助下对三氟硼酸芳基酯进行金属转移,生成的芳基铜中间体通过非S N 2氧化添加至N-甲氧基酰胺并随后进行还原消除而提供了苯胺。
The first B(C6F5)3‐catalyzed deoxygenative reduction of amides into the corresponding amines with readily accessible and stable ammonia borane (AB) as a reducing agent under mild reaction conditions is reported. This metal‐free protocol provides facile access to a wide range of structurally diverse amine products in good to excellent yields, and various functional groups including those that are reduction‐sensitive
据报道,在温和的反应条件下,用易于获得且稳定的氨硼烷(AB)作为还原剂,将酰胺进行的首次B(C 6 F 5)3催化脱氧还原为相应的胺。该无金属方案可轻松获得各种结构多样的胺产品,且收率高至优异,并且对各种官能团(包括对还原敏感的官能团)均具有良好的耐受性。该新方法也适用于手性酰胺底物,而不会破坏对映体的纯度。BF 3 OEt 2助催化剂在该反应中的作用是通过酰胺-硼加合物的原位形成来活化酰胺羰基。
Ru‐Catalyzed Deoxygenative Transfer Hydrogenation of Amides to Amines with Formic Acid/Triethylamine
ruthenium(II)‐catalyzed deoxygenative transfer hydrogenation of amides to amines using HCO2H/NEt3 as the reducing agent is reported for the first time. The catalyst system consisting of [Ru(2‐methylallyl)2(COD)], 1,1,1‐tris(diphenylphosphinomethyl) ethane (triphos) and Bis(trifluoromethane sulfonimide) (HNTf2) performed well for deoxygenative reduction of various secondary and tertiary amides into the corresponding
首次报道了使用HCO 2 H / NEt 3作为还原剂的钌(II)催化的酰胺脱氧转移胺成胺。催化剂体系由[Ru(2-甲基烯丙基)2(COD)],1,1,1-三(二苯基膦甲基)乙烷(triphos)和双(三氟甲烷磺酰亚胺)(HNTf 2)在将各种仲酰胺和叔酰胺脱氧还原成相应的胺方面表现出色,选择性极好,并且对包括还原敏感基团在内的官能团表现出很高的耐受性。氢源和酸助催化剂的选择对于催化至关重要。机理研究表明,通过借入氢对原位生成的醇和胺进行还原胺化是主要途径。
Boron Lewis Acid Promoted Ruthenium-Catalyzed Hydrogenation of Amides: An Efficient Approach to Secondary Amines
作者:Ming-Lei Yuan、Jian-Hua Xie、Qi-Lin Zhou
DOI:10.1002/cctc.201600635
日期:2016.10.6
The hydrogenation of amides to amines has been developed by using the catalyst [Ru(H)2(CO)(Triphos)] (Triphos=1,1,1‐tri(diphenylphosphinomethyl)ethane) and catalytic boron Lewis acids such as B(C6F5)3 or BF3⋅Et2O as additives. The reaction provides an efficient method for the preparation of secondary amines from amides in good yields with high selectivity.
Unlocking Amides through Selective C–N Bond Cleavage: Allyl Bromide-Mediated Divergent Synthesis of Nitrogen-Containing Functional Groups
作者:Karthick Govindan、Nian-Qi Chen、Yu-Wei Chuang、Wei-Yu Lin
DOI:10.1021/acs.orglett.1c03541
日期:2021.12.17
We report a new set of reactions based on the unlocking of amides through simple treatment with allyl bromide, creating a common platform for accessing a diverse range of nitrogen-containing functional groups such as primary amides, sulfonamides, primary amines, N-acyl compounds (esters, thioesters, amides), and N-sulfonyl esters. The method has potential industrial applicability, as demonstrated through
Efficient Synthesis of Trisimidazole and Glutaric Acid Bearing Porphyrins: Ligands for Active-Site Models of Bacterial Nitric Oxide Reductase
作者:James P. Collman、Yi-Long Yan、Jianping Lei、Peter H. Dinolfo
DOI:10.1021/ol053118z
日期:2006.3.2
Ligands (1) for active-site models of bacterial nitric oxide reductase (NOR) have been efficiently synthesized. These compounds (1) feature three imidazolyl moieties and one carboxylic acid residue at the FeB site, which represent the closest available syntheticmodelligands of NOR active center. The stereo conformations of these ligands are established on the basis of steric effects and 1H NMR chemical
高效合成了用于细菌一氧化氮还原酶(NOR)活性位点模型的配体(1)。这些化合物(1)在FeB位点具有3个咪唑基部分和1个羧酸残基,代表NOR活性中心最接近的合成模型配体。这些配体的立体构象是根据卟啉的环电流效应的空间效应和1 H NMR化学位移确定的。