abundant alkyl esters to afford amide bonds with exquisite selectivity by acyl C-O bond cleavage. The utility of this process is showcased by a broad scope of the method, including various sensitive functional groups, late-stage modification and the synthesis of drug molecules (>80 examples). Remarkable selectivity towards different functional groups and within different amide and ester electrophiles
酰胺键是化学和生物学中最基本的官能团之一,在许多简化关键药物和工业分子合成的过程中发挥着核心作用。尽管酰胺的合成是学术和工业科学家最常进行的反应之一,但由于该过程不利的动力学和热力学贡献,叔酰胺的直接转酰胺具有挑战性。在此,我们报告了第一种通用的、温和的和高度化学选择性的方法,用于通过非亲核胺的直接酰基 NC 键裂解对未活化的叔酰胺进行转酰胺。这种操作简单的方法是在没有过渡金属的情况下进行的,并且在异常温和的反应条件下进行。在这种情况下,我们进一步描述了大量烷基酯的直接酰胺化,以通过酰基 CO 键裂解提供具有极好的选择性的酰胺键。该方法的广泛应用展示了该过程的实用性,包括各种敏感的官能团、后期修饰和药物分子的合成(> 80 个例子)。观察到对不同官能团以及不同酰胺和酯亲电试剂的显着选择性,这是使用现有方法不可行的。进行了广泛的实验和计算研究,以深入了解高选择性的机制和起源。我们进一步提出了
Tandem Photoredox Catalysis: Enabling Carbonylative Amidation of Aryl and Alkylhalides
作者:José A. Forni、Nenad Micic、Timothy U. Connell、Geethika Weragoda、Anastasios Polyzos
DOI:10.1002/anie.202006720
日期:2020.10.12
visible‐light‐mediated carbonylative amidation of aryl, heteroaryl, and alkyl halides. A tandem catalytic cycle of [Ir(ppy)2(dtb‐bpy)]+ generates a potent iridium photoreductant through a second catalytic cycle in the presence of DIPEA, which productively engages aryl bromides, iodides, and even chlorides as well as primary, secondary, and tertiary alkyl iodides. The versatile in situ generated catalyst is compatible
Chalcogen Bonding and Hydrophobic Effects Force Molecules into Small Spaces
作者:Faiz-Ur Rahman、Demeter Tzeli、Ioannis D. Petsalakis、Giannoula Theodorakopoulos、Pablo Ballester、Julius Rebek、Yang Yu
DOI:10.1021/jacs.0c01290
日期:2020.3.25
catalysis and material science. We report here the use of chalcogen bonding to form container assemblies stable in water. Cavitands 1-3 functionalized with 2,1,3-benzoselenadiazole walls were synthesized in good yields from resor-cin[4]arenes. The solid state singlecrystalX-raystructure of 3 showed a dimeric assembly cemented together through multi-ple Se⋅⋅⋅N chalcogen bonds. Binding of hydrophobic and
Iron‐Catalyzed Oxidative Coupling Reaction of Isocyanides and Simple Alkanes towards Amide Synthesis
作者:Hongdong Yuan、Zhiqiang Liu、Yushu Shen、Hongbin Zhao、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1002/adsc.201801619
日期:2019.4.23
An iron‐catalyzed oxidative coupling reaction of isocyanide and readily available alkane has been disclosed. In the presence of a catalytic amount of FeCp2 (10 mol%), heating a mixture of alkane, isocyanide, and DTBP in DCE allows for the formation of an amide. This reaction tolerates many simple alkanes including cycloalkanes and chain alkanes. Furthermore, a series of aromatic isocyanides having
A [bmIm]OH-catalyzed amidation of azides and aldehydes is reported. The overall transformation involves azide-enolate cycloaddition, which subsequently undergoes rearrangement to give amides.