Efficient Synthesis of 2-Substituted-1,2,3-triazoles
摘要:
In this three-component reaction, alkynes undergo a copper(I)-catalyzed cycloaddition with sodium azide and formaldehyde to yield 2-hydroxymethyl-2H-1,2,3-triazoles, which are useful intermediates that can be readily converted to polyfunctional molecules. The hydroxymethyl group can also be removed, providing convenient access to NH-1,2,3-triazoles. The reaction is experimentally simple and readily scalable.
Efficient Synthesis of 2-Substituted-1,2,3-triazoles
摘要:
In this three-component reaction, alkynes undergo a copper(I)-catalyzed cycloaddition with sodium azide and formaldehyde to yield 2-hydroxymethyl-2H-1,2,3-triazoles, which are useful intermediates that can be readily converted to polyfunctional molecules. The hydroxymethyl group can also be removed, providing convenient access to NH-1,2,3-triazoles. The reaction is experimentally simple and readily scalable.
A range of 4- and 5-substituted N-benzyl-1,2,3-triazoles have been submitted to debenzylation using Pd/C and hydrogen in the presence of 1,1,2-trichloroethane. Triazoles with oxygen-containing substituents are efficiently debenzylated under these conditions. Triazoles with a phenyl or benzyl substituent on C4 or C5 are not debenzylated, whereas a pentyl-substituted derivative was readily debenzylated.