Asymmetric Transfer Hydrogenation of α-Keto Amides; Highly Enantioselective Formation of Malic Acid Diamides and α-Hydroxyamides
作者:Shweta K. Gediya、Vijyesh K. Vyas、Guy J. Clarkson、Martin Wills
DOI:10.1021/acs.orglett.1c02830
日期:2021.10.15
The asymmetric transfer hydrogenation (ATH) of α-keto-1,4-diamides using a tethered Ru/TsDPEN catalyst was achieved in high ee. Studies on derivatives identified the structural elements which lead to the highest enantioselectivities in the products. The α-keto-amide reduction products have been converted to a range of synthetically valuable derivatives.
使用系留的 Ru/TsDPEN 催化剂在高 ee 下实现了 α-酮基-1,4-二酰胺的不对称转移氢化(ATH)。对衍生物的研究确定了导致产品中最高对映选择性的结构元素。α-酮酰胺还原产物已转化为一系列具有合成价值的衍生物。
Reagent Design and Ligand Evolution for the Development of a Mild Copper-Catalyzed Hydroxylation Reaction
作者:Patrick S. Fier、Kevin M. Maloney
DOI:10.1021/acs.orglett.7b01403
日期:2017.6.2
modular ligand library, high-throughput experimentation, and rational ligand evolution have led to a novel copper catalyst for the synthesis of phenols with a traceless hydroxide surrogate. The mild reaction conditions reported here enable the late-stage synthesis of numerous complex, druglike phenols.
visible-light-mediated photoredox oxidative approach for generating carbamoylradicals from oxamic acids is disclosed. Reaction of the generated carbamoylradicals with electron-deficient alkenes opens efficient access to 3,4-dihydroquinolin-2(1H)-ones under mild conditions through a sequence of intermolecular radical addition, cyclization, and aromatization. The process is compatible with a variety of
nickel-catalyzed aminocarbonylation of (hetero)aryl bromides was developed. The utilization of readily available oxamic acids, the application of a broadly used organic photoredox catalyst (4CzIPN), and mild reaction conditions make this transformation an appealing alternative to classical amidation procedures. The generation of carbamoyl radicals was supported by trapping reactions with a hydrogen
开发了一种用于(杂)芳基溴的光氧化还原和镍催化氨基羰基化的有效方法。利用容易获得的草酸、广泛使用的有机光氧化还原催化剂 (4CzIPN) 和温和的反应条件,使这种转化成为经典酰胺化程序的有吸引力的替代方案。在 D 2 O 存在下,通过与氢原子转移催化剂的捕获反应支持氨基甲酰基自由基的产生,产生氘代甲酰胺。对于各种草酸,证实了该氘化方案的通用性。