Abstract
The ruthenium-catalyzed [3+2] cycloaddition of internal unsymmetrically disubstituted alkynes with alkyl azides to form 1,4,5-trisubstituted-1,2,3-triazoles in good to excellent yields is reported. Depending on the alkyne substituents, either isomer A or B is regioselectively formed. If R2 is an electron-withdrawing group, A is obtained exclusively; B is obtained as a single regioisomer with propargyl alcohols and amines. On the other hand, if R2 is an alkyl group, a mixture of both isomers is formed.
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