Copper-mediated trifluoromethylation of 5-iodotriazole with (trifluoromethyl)trimethylsilane promoted by silver carbonate
摘要:
A novel and mild method for copper-mediated trifluoromethylation of 5-iodotriazole using (trifluoromethyl)trimethylsilane (Me3SiCF3) as trifluoromethylating reagent with the assistance of Ag2CO3 was developed. (C) 2013 Elsevier B.V. All rights reserved.
Synthesis of 5-Fluorotriazoles by Silver-Mediated Fluorination of 5-Iodotriazoles
作者:Damin Wang、Wenjing Sun、Taiwei Chu
DOI:10.1002/ejoc.201500338
日期:2015.7
developed for the direct fluorination of 5-iodotriazoles with AgF as fluoride source and N1,N1,N2,N2-tetramethylethane-1,2-diamine (TMEDA) as ligand. This method is compatible with various functional groups. 5-Iodotriazoles without aromatic groups at the 4-position or aliphatic substituents at the N1 position can also be smoothly converted to the corresponding 5-fluorotriazoles. Preliminary mechanism
Catalytic and Computational Studies of N-Heterocyclic Carbene or Phosphine-Containing Copper(I) Complexes for the Synthesis of 5-Iodo-1,2,3-Triazoles
作者:Steven Lal、Henry S. Rzepa、Silvia Díez-González
DOI:10.1021/cs500326e
日期:2014.7.3
Two complementary catalytic systems are reported for the 1,3-dipolar cycloaddition of azides and iodoalkynes. These are based on two commercially available/readily available coppercomplexes, [CuCl(IPr)] or [CuI(PPh3)3], which are active at low metal loadings (PPh3 system) or in the absence of any other additive (IPr system). These systems were used for the first reported mechanistic studies on this
Copper(I)-Phosphinite Complexes in Click Cycloadditions: Three-Component Reactions and Preparation of 5-Iodotriazoles
作者:Juana M. Pérez、Peter Crosbie、Steven Lal、Silvia Díez-González
DOI:10.1002/cctc.201600234
日期:2016.7.6
displayed by copper(I)–phosphinite complexes of general formula [CuBr(L)] in two challenging cycloadditions is reported: a) the one‐pot azidonation/cycloaddition of boronic acids, NaN3, and terminal alkynes; b) the cycloaddition of azides and iodoalkynes. These air‐stable catalysts led to very good results in both cases and the expected triazoles could be isolated in pure form under ‘Click‐suitable’ conditions
An effective synthetic protocol for 5-halo-1,2,3-triazoles was developed by novel TBDMSCI (tert-butyldi-methylsily1 chloride)-activated aerobic oxidative halogenations in this Letter. TBDMSCI, for the first time, was found to activate aerobic oxidation of CuX to produce X-2 with Cu+ which then could effectively promote one-pot syntheses of 5-halo-1,2,3-triazole from alkyne, azide, and CuX (X = I, Br) under O-2 atmosphere at room temperature. The advantages in this method include inexpensive and green O-2 as oxidant, use of mild and non-oxidative additive, and wide scope of substrates. (C) 2013 Elsevier Ltd. All rights reserved.