Divergent Reactivity of gem-Difluoro-enolates toward Nitrogen Electrophiles: Unorthodox Nitroso Aldol Reaction for Rapid Synthesis of α-Ketoamides
摘要:
An amination reaction of in situ generated gem-difluoro-enolates has been explored with electrophilic nitrogen sources. While their exposure to azodicarboxylates smoothly produced fluorinated alpha-amino ketones, reaction with nitro-soarenes (nitroso aldol reaction) furnished alpha-ketoamides in very high yields (up to 94%). The reaction is very fast (typically completed within 5 min) and scalable and tolerates various sensitive functional groups. Synthetic utility of this process was highlighted through the production of diverse nitrogen heterocycles and an orexin receptor antagonist.
Development of C–N coupling processes is fundamentally important and challenging for the synthesis of biologically active molecules and drugs. Herein, we report a highly atom efficient green process for the synthesis of α-ketoamides via visible-light induced copper(I) chloride catalysed direct oxidative Csp–N coupling reactions using commercially available alkynes and anilines at room temperature without
Molybdenum-Catalyzed Intermolecular Deoxygenative Cross-Coupling Reactions of 1,2-Diketones with α-Ketoamides
作者:Yuan-Qing Dong、Kai Wang、Chun-Xiang Zhuo
DOI:10.1021/acscatal.2c03731
日期:2022.9.16
carbon–nitrogen bond and a carbon–carbon double bond in one step under Mo-catalysis. Various pyrrol-2-ones were secured in up to 96% yield by utilizing a commercial Mo-catalyst. The synthetic potential of the current methodology is additionally demonstrated by synthetic transformations, a gram-scale synthesis, and derivatization of several natural products and drug molecules. The preliminary mechanistic
Ru(<scp>ii</scp>)-catalyzed oxidative coupling of sulfoxonium ylides with amines: efficient synthesis of α-ketoamides and indolo[2,1-<i>a</i>]isoquinolines
The first use of sulfoxonium ylides for the synthesis of α-ketoamides is described via a Ru(II)-catalyzed amidation reaction with amines. The same Ru(II)-catalyzed reaction of sulfoxonium ylides with 2-phenylindoles provided indolo[2,1-a]isoquinolines instead of α-ketoamides.
通过Ru( II ) 催化的与胺的酰胺化反应,描述了氧化亚硝叶立德首次用于合成 α-酮酰胺。相同的 Ru( II ) 催化的氧化锍叶立德与 2-苯基吲哚的反应提供了吲哚[2,1- a ] 异喹啉而不是 α-酮酰胺。
Highly regioselective synthesis of lactams <i>via</i> cascade reaction of α,β-unsaturated ketones, ketoamides, and DBU as a catalyst
作者:Xin Qin、Jinhai Zhang、Zhan-Yong Wang、Yimei Song、Yixiao Yang、Wenhai Zhang、Hongxin Liu
DOI:10.1039/d2ra07117g
日期:——
Herein, the aldol/Michael cascade reaction on the β,γ-positions of α,β-unsaturatedketones with ketoamides to construct bicyclic lactams via DBU catalysis has been developed. The substrates were well-tolerated with high regio- and diastereoselectivities in moderate to good yields (32 examples). The control experiments revealed that the hydrogen of the amide was the key factor.
An amination reaction of in situ generated gem-difluoro-enolates has been explored with electrophilic nitrogen sources. While their exposure to azodicarboxylates smoothly produced fluorinated alpha-amino ketones, reaction with nitro-soarenes (nitroso aldol reaction) furnished alpha-ketoamides in very high yields (up to 94%). The reaction is very fast (typically completed within 5 min) and scalable and tolerates various sensitive functional groups. Synthetic utility of this process was highlighted through the production of diverse nitrogen heterocycles and an orexin receptor antagonist.