这项工作报告了一种通过有效的非均相催化剂将α-酮酰胺催化转移加氢(CTH)转化为β-氨基的可持续路线,其中钌掺入了氮化碳载体(Ru–gC 3 N 4)。还使用相同的载体筛选了其他不同的金属(如Ni或Pd),但没有一个显示出有效的活性。尽管基于使用所有上述催化剂的反应参数的优化,也已经观察到酮部分氢化为醇。使用场发射枪扫描电子显微镜(FEG-SEM),X射线衍射(XRD),X射线光电子能谱(XPS),红外(IR)光谱和热重分析(TGA)对催化剂进行了表征。此外,该催化剂已经再循环并进一步表征,并且对于CTH方法的反应性没有任何明显的变化。Ru–gC 3 N 4由于可循环利用的多相催化剂首次用于将α-酮基酰胺的CTH转化为β-氨基,因此该方法具有可持续性,因为使用了经济环保的异丙醇作为溶剂体系。所提出的催化体系显示出广泛的α-羟基酰胺和β-氨基衍生物底物,这些底物已通过1 H和13 C-NMR证实。
Copper-Catalyzed Aerobic Oxidative Cross-Dehydrogenative Coupling of Amine and α-Carbonyl Aldehyde: A Practical and Efficient Approach to α-Ketoamides with Wide Substrate Scope
A copper-catalyzedaerobicoxidative cross-dehydrogenative coupling (CDC) of amine with α-carbonyl aldehyde has been developed. Many types of amines are tolerant in this transformation leading to various α-ketoamides compounds. Wide substrate scope, CDC strategy and using air as oxidant make this transformation highly efficient and practical. Molecular oxygen acts not only as the oxidant, but also
A simple and practical method for α-ketoamide synthesis via a decarboxylative strategy of isocyanates with α-oxocarboxylic acids is described. The reaction proceeds at room temperature under mild conditions without an oxidant or an additive, showing good substrate scope and functional compatibility. Moreover, the applicability of this method was further demonstrated by the synthesis of various bioactive
Copper-catalyzed oxidative cleavage of Passerini and Ugi adducts in basic medium yielding α-ketoamides
作者:Anirban Ghoshal、Mayur D. Ambule、Revoju Sravanthi、Mohit Taneja、Ajay Kumar Srivastava
DOI:10.1039/c9nj03533h
日期:——
oxidative cleavage of Passerini and Ugi adducts in the presence of base and copper(I) iodide is studied in detail. The oxidative cleavage yields α-ketoamides along with acids and amides from Passerini and Ugi adducts respectively. Mechanistic investigations revealed that the reaction proceeds via a radical pathway involving molecular oxygen. Control experiments with 18O-labeled Passerini adducts confirmed
An efficient and practical method was developed for the synthesis of tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones based on the decarboxylative cyclization reaction of α-ketoamides and proline. In most cases, tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones were obtained with perfect diastereoselectivity to give trans-isomer in excellent yield.
基于α-酮酰胺与脯氨酸的脱羧环化反应,开发了一种高效,实用的四氢-1 H-吡咯并[1,2 - a ]咪唑-2-酮的合成方法。在大多数情况下,以完美的非对映选择性获得四氢-1 H-吡咯并[1,2- a ]咪唑-2-酮,从而以优异的收率得到反式异构体。