The three-component reaction of benzotriazoles, aldehydes, and
alkynes has been carried out for the first time using zinc bromide
as a catalyst. The corresponding propargylbenzotriazoles are formed
in high yields (79-97%) within 6-10 hours.
propargyl-1,2,3-triazole - benzotriazole - aldehyde - alkyne - zinc bromide