• Reactant for preparation of β-carbolines via diastereo- and enantioselective Bronsted acid catalyzed N-acyliminium cyclization cascades1 • Reactant for preparation of substituted tetrahydro-β-carbolines as potential agents for treatment of human papillomavirus infection (HPV)2 • Reactant for asymmetric synthesis of nitrogen heterocycles via Bronsted acid-catalyzed N-acyliminium cyclization cascade3 • Reactant for amidation reactions4 • Reactant for preparation of potent β3-adrenergic receptor agonists5 • Reactant for preparation of tryptamine-based sulfonamides as potent and selective inhibitors of 15-lipoxygenase6