Gold-Catalyzed Cyclization Reaction of Alkynyl O-tert-Butylcarbamates

A Ag2CO3/TFA-catalyzed intramolecular annulation approach to imidazo[1,2-c][1,3]oxazin-5-one derivatives

“…1d). 45 However, this strategy has been scarcely explored and only reserved for specific substrates such as N -Boc-6-alkynyl-3,4-dihydro-2 H -pyridine 46 (Fig. 1e) and N -Boc-2-alkynylindole 47 derivatives (Fig.…”