Gold(I) Complexes Bearing Ring-Fused Benzoxazine-Derived Triazolylidenes And Their Use In C-N Bond-Forming Processes

We report the synthesis and full characterization of a novel series of ring-fused benzoxazine-derived triazolium salts (1a-c) and their corresponding triazolylidene gold(I) complexes (2a-c). All new compounds were fully characterized by means of H-1 and C-13 NMR spectroscopy, elemental analyses, and mass spectroscopy and in the case of triazoliums 1a and 1b by single-crystal X-ray diffraction. The new triazolylidene gold complexes (2a-c) were tested as precatalysts in the hydroamination and hydrohydrazination of terminal alkynes employing aniline derivatives and hydrazine as nitrogen sources, respectively.