Co-Catalyzed Synthesis of <i>N</i>-Sulfonylcarboxamides from Carboxylic Acids and Sulfonyl Azides
作者:Yue Fang、Zheng-Yang Gu、Shun-Yi Wang、Jin-Ming Yang、Shun-Jun Ji
DOI:10.1021/acs.joc.8b01300
日期:2018.8.17
A Co-catalyzed effective synthesis of N-sulfonylcarboxamides from the reaction of carboxylicacids and organic azides in the presence of isocyanide has been developed. The protocol has the advantages of short time, low temperature, and being oxidant-free, which provides a new and simple approach for the synthesis of N-sulfonylcarboxamides in good to excellent yields with a broad substrate scope.
Controllable construction of isoquinolinedione and isocoumarin scaffolds <i>via</i> Rh<sup>III</sup>-catalyzed C–H annulation of <i>N</i>-tosylbenzamides with diazo compounds
An efficient protocol for the synthesis of isoquinolinediones by RhIII-catalyzed C–H activation/annulation/decarboxylation of N-tosylbenzamides with diazo compounds is reported.
Metal-free C–H Activation over Graphene Oxide toward Direct Syntheses of Structurally Different Amines and Amides in Water
作者:Prashant Shukla、Ambika Asati、Smita R. Bhardiya、Manorama Singh、Vijai K. Rai、Ankita Rai
DOI:10.1021/acs.joc.0c02219
日期:2020.12.4
Unprecedented metal-free synthesis of a variety of amines and amides is reported via amination of C(sp3)–H and C(sp2)–H bonds. The strategy involves graphene-oxide/I2-catalyzed nitrene insertion using PhINTs as a nitrene (NT) source in water at room temperature. A wide range of structurally different substrates, viz., cyclohexane, cyclic ethers, arenes, alkyl aromatic systems, and aldehydes/ketones
据报道,通过胺化C(sp 3)–H和C(sp 2)–H键,空前合成了多种胺和酰胺。该策略涉及在室温下使用PhINTs作为水中的腈(NT)源使用氧化石墨烯/ I 2催化的腈插入。尽管具有较低的收率,但已成功地使用各种结构不同的底物,即环己烷,环醚,芳烃,烷基芳族体系和具有α-苯环的醛/酮,以高收率获得了相应的腈插入产物在少数情况下。所设想的方法在操作简便性,无金属催化,使用水作为溶剂,环境反应条件和催化剂的可重复使用性方面均优于其他方法。
Formation of new C–O and C–N bonds via base promoted Csp2–Csp3 bond cleavage of α-nitro ketone
A catalyst free protocol has been developed for nucleophilic Csp2–Csp3 bondcleavage of α-nitroketone in the presence of potassium carbonate to create new C–O and C–N bonds. A series of different substituted α-nitroketones could be selectively cleaved and converted into corresponding esters and tosylamides in the presence of alcohols and bromamine-T, respectively.
A highly efficient catalyst-free protocol for C–H bond activation: sulfamidation of alkyl aromatics and aldehydes
作者:Arun Jyoti Borah、Prodeep Phukan
DOI:10.1039/c2cc31258a
日期:——
A catalyst-free protocol has been developed for amidation of alkyl aromatics and aldehydes using TsNBr(2)via a nitrene transfer process in the presence of a base in excellent yield within a short time. The reaction was found to be selective for secondary and tertiary benzylic C-H bonds and C-H bonds of aldehydic groups.