A new class of pyrido-annulated triazolium salts 2a～2l has been synthesized and its application to the benzoin condensation and transesterification reaction catalyzed by pyrido-annulated triazolium salts was explored, Reaction condition effect was tested. The triazolium salt 2c turned out to be a powerful catalyst in benzoin condensation and transesterification reaction, which was comparable with or even superior to other well-established triazolylidenes already in the literature.

Key words: pyrido-annulated triazolium salt, N-heterocyclic carbene, benzoin condensation, transesterification reaction