18922-69-5Relevant academic research and scientific papers
General solution to the synthesis of N-2-substituted 1,2,3-triazoles
Wang, Xiao-Jun,Zhang, Li,Krishnamurthy, Dhileepkumar,Senanayake, Chris H.,Wipf, Peter
scheme or table, p. 4632 - 4635 (2010/12/18)
The regioselective N-alkylation of 1,2,3-triazoles 1 - 6 was studied. Good to excellent N-2 selectivity and high chemical yields for N-2-substituted 4,5-dibromotriazoles 7 were obtained with 4,5-dibromo- and 4-bromo-5- trimethylsilyl-1,2,3-triazoles. These building blocks can be readily converted to 2-mono-, 2,4-di-, and 2,4,5-polysubstituted triazoles 10 - 15, providing a general, protective, group-free method for the synthesis of N-2-substituted triazoles. Observed regioselectivities can be rationalized by a combination of Frontier Molecular Orbital, steric, and electrostatic directing effects on the heterocyclic scaffolds.
Alkylation, Acylation and Silylation of Azoles
Begtrup, Mikael,Larsen, Peter
, p. 1050 - 1057 (2007/10/02)
Performing alkylation, acylation and silylation reactions in separate deprotonation and nucleophilic displacement steps allows for better control of reaction conditions and facilitates problem handling in these processes.In the alkylation of azoles the alkylating agents and solvents possess individual reaction capabilities which seem to be approximately additive.Monoalkylation occurs if the sum of the normalized reaction potentials is equal or larger than the pKa value of the azole.Dialkylation is avoided by keeping the sum of the normalized reaction potentials below the pKa value of the alkylazole.The applicability of these principles is demonstrated by the development of effective procedures for the methylation, benzylation, acetylation, methoxycarbonylation and trimethylsilylation of azoles.
UNSATURATED CARBONYL-CONTAINING COMPOUNDS. XXVIII. CYCLOADDITION OF ORGANIC AZIDES TO α-ACETYLENIC KETONES AND ACIDS
Vereshchagin, L. I.,Tikhonova, L. G.,Maksikova, A. V.,Serebryakova, E. S.,Proidakov, A. G.,Filippova, T. M.
, p. 641 - 648 (2007/10/02)
The reaction of α-acetylenic ketones and acids with organic azides leads to the formation of 1-alkyl(aryl)-4-acyl(carboxy)-1,2,3-triazoles or to a mixture of the 1,4- and 1,5-disubstituted isomers.The effect of the structure of the initial compound and of the solvent on the direction of cycloaddition was investigated.
