A regioselective α-heteroarylation followed by deoxygenation towards the synthesis of variety of azine triazole from simple azine N-oxides derivatives and N-tosyl-1,2,3-triazoles has been described. The reaction is metal free and basefree with shorter reaction time, high yields and a broad substrate scope.
A general catalytic method using a Mn‐porphyrin‐based catalytic system is reported that enables two different reactions (click reaction and denitrogenative annulation) and affords two different classes of nitrogen heterocycles, 1,5‐disubstituted 1,2,3‐triazoles (with a pyridyl motif) and 1,2,4‐triazolo‐pyridines. Mechanistic investigations suggest that although the click reaction likely proceeds through
0 cm2 Cu0 sheets as a reducing agent and 10 mol% N-methylimidazole (NMI) exhibit good activities for aerobicoxidation of benzyl alcohol to benzaldehyde. Catalytic studies have shown that the activities were higher with more electron-rich N-based ligands. Furthermore, oxidation of aliphatic alcohols such as 1-hexanol and 2-methyl-1-pentanol using the Cu catalyst system with the NN′py ligand at room
一系列含有吡啶-三唑配体的Cu(NN')2(OTf)2配合物[OTf = OSO 2 CF 3;NN'= NN'博士(1),N-N'十六进制(2),NN'的py(3)]与在三唑N4位置或2,2'-联吡啶不同的取代基(联吡啶; 4)已经被合成。1和3的晶体结构揭示了反式异构体,对正型三唑配位(针对3)具有较强的偏好,而Cu-bipyridine配合物4在顺式中更稳定-形式。的循环伏安法1-4表明,给电子强度如下趋势:BPY> NN' PY > NN'六角〜NN'博士。在2×2.0 cm 2 Cu 0的存在下,催化剂体系由5 mol%Cu(OTf)2 / NN'/ TEMPO(TEMPO =(2,2,6,6-四甲基哌啶-1-基)氧基)组成作为还原剂和10 mol%N-甲基咪唑(NMI)具有良好的活性,可将苄醇好氧氧化为苯甲醛。催化研究表明,使用更多的富含电子的N基配体时,活性更高。此外,在室温
Fused Tetrazoles as Azide Surrogates in Click Reaction: Efficient Synthesis of N-Heterocycle-Substituted 1,2,3-Triazoles
作者:Buddhadeb Chattopadhyay、Claudia I. Rivera Vera、Stepan Chuprakov、Vladimir Gevorgyan
DOI:10.1021/ol100745d
日期:2010.5.7
It has been shown that various pyrido-, quinolino-, pyrazino-, and quinoxalinotetrazoles can be used efficiently as azide components in Cu-catalyzed clickreaction with alkynes. This method allows for efficient synthesis of a wide variety of N-heterocyclic derivatives of 1,2,3-triazoles.
Synthesis and NMR Analysis of 1,4-Disubstituted 1,2,3-Triazoles Tethered to Pyridine, Pyrimidine, and Pyrazine Rings
作者:Aljoša Bolje、Damijana Urankar、Janez Košmrlj
DOI:10.1002/ejoc.201403100
日期:2014.12
modular approach based on the “click” copper(I)-catalysed azide–alkyne cycloaddition reaction was used to prepare a library of selected 1,4-disubstituted1,2,3-triazoles differently functionalized with heteroaryl groups including pyridine, pyrimidine, and pyrazine. Three different copper(I) sources, i.e., CuSO4/sodium ascorbate, CuBr(PPh3)3, and (CuOTf)2·C6H6 were used to promote the coupling reactions