jo061688m_si_001.pdf (2.1 MB)
A Study of the Scope and Regioselectivity of the Ruthenium-Catalyzed [3 + 2]-Cycloaddition of Azides with Internal Alkynes
journal contribution
posted on 2006-10-27, 00:00 authored by Max M. Majireck, Steven M. Weinreb[3 + 2]-Cycloadditions of alkyl azides with various unsymmetrical internal alkynes in the presence of Cp*RuCl(PPh3)2
as catalyst in refluxing benzene have been examined, leading
to 1,4,5-trisubstituted-1,2,3-triazoles. Whereas alkyl phenyl
and dialkyl acetylenes undergo cycloadditions to afford
mixtures of regioisomeric 1,2,3-triazoles, acyl-substituted
internal alkynes react with complete regioselectivity. In
addition, propargyl alcohols and propargyl amines were
found to react with azides to afford single regioisomeric
products.