A Metal-Free Cross-Dehydrogenative Coupling Reaction of Amides to Access N-Alkylazoles
作者:Shengmei Guo、Hu Cai、Zheng Zhu、Yufeng Wang、Mingmeng Yang、Ling Huang、Jiuhan Gong
DOI:10.1055/s-0036-1588307
日期:——
An iodine-catalyzed cross-dehydrogenativecouplingreaction of N-alkyl amides and azoles is reported. The catalytic system provides an efficient method for introducing amides onto azoles, especially onto benzotriazoles.
Metal-free Cross-Dehydrogenative Coupling of <i>HN</i>-azoles with α-C(sp<sup>3</sup>)-H Amides via C–H Activation and Its Mechanistic and Application Studies
作者:Hariprasad Aruri、Umed Singh、Mukesh Kumar、Sumit Sharma、Sravan Kumar Aithagani、Vivek K. Gupta、Serge Mignani、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1021/acs.joc.6b02448
日期:2017.1.20
A metal-free one step coupling reaction between various N-azole rings and diverse α-C(sp3)-H containing amides has been developed under oxidative reaction conditions. Commercially available tetrabutyl ammonium iodide (TBAI) in the presence of terbutylhydroperoxide (TBHP), under neat reaction condition, efficiently catalyzed the coupling. Various azole types, such as 1H-benzotriazoles, 1H-1,2,3-triazoles
在氧化反应条件下,已开发出各种N-唑环与各种含α-C(sp 3)-H的酰胺之间的无金属一步偶联反应。在纯净的反应条件下,在叔丁基过氧化氢(TBHP)存在下,市售的碘化四丁基碘化铵(TBAI)有效地催化了偶联反应。各种唑类型,例如1 H-苯并三唑,1 H -1,2,3-三唑,1 H -1,2,4-三唑,1 H-四唑,1 H-吡唑和1 H-苯并咪唑,和含α-C(sp 3)-H的酰胺,例如N,N-二甲基乙酰胺,N,Ñ二甲基苯甲酰胺,Ñ甲基乙酰胺,Ñ,Ñ -diethylacetamide,Ñ -甲基吡咯烷和吡咯烷-2-酮,被成功地用于偶联。为了研究不同中间体的参与,还进行了一系列设计和控制的实验。根据证据,还提出了一个合理的机制。这些新颖,简单,快速,有吸引力和直接的转变为构造新型高度功能化的N开辟了道路。-唑类通过直接的共价N–H键转换为N–C键而形成。该方法允许使用经典的合成方法合成需要多个步骤的复杂分子。此外,含α-C(sp
Synthesis and Mechanism of PBI Phosphonate, Poly[2,2′-(-<i>m</i>-phenylene)-5,5′-Bibenzimidazole Phosphonate Ester], and its Polyphosphonic Acid Derivatives
作者:Frederick E. Johnson、Israel Cabasso
DOI:10.1021/ma100320w
日期:2010.4.27
reacting poly[2,2′-(m-phenylene)-5,5′-bibenzimidazole] (PBI) with diethyl phosphite and a peroxide, in N,N-dimethylacetamide solution, via a free radical mechanism. The phosphonate ester groups are linked directly to the aromatic backbone thus establishing a strong −(O═)P−Ph− bond. The highly phosphonylated products dissolve in lower alcohols and the corresponding polyphosphonic acids (PBIPOH) dissolve
Transition-metal-free, oxidative C(sp<sup>3</sup>)–H arylation of amides with zeolite catalysts
作者:Jannick Vercammen、Besir Krasniqi、Dirk De Vos
DOI:10.1039/d3cy00880k
日期:——
Zeolite catalysts in combination with tert-butylperoxy ethylhexyl carbonate (TBEC) as oxidant promote oxidative coupling reactions with amides.
沸石催化剂与作为氧化剂的叔丁基过氧化乙基己基碳酸酯(TBEC)相结合,可促进与酰胺的氧化偶联反应。
Iron-Catalyzed N-Alkylation of Azoles via Cleavage of an sp<sup>3</sup> C–H Bond Adjacent to a Nitrogen Atom
作者:Qinqin Xia、Wanzhi Chen
DOI:10.1021/jo301568e
日期:2012.10.19
Iron-catalyzed direct C-N bond formation between azoles and amides is described. The oxidative coupling reactions of sp(3) C-H bonds adjacent to a nitrogen atom in amides and sulfonamides with the N-H bond in azoles proceeded smoothly in the presence of FeCl2 and di-tert-butyl peroxide (DTBP).