• Reactant for preparation of tryptophan dioxygenase inhibitors pyridyl-ethenyl-indoles as potential anticancer immunomodulators1 • Reactant for preparation of cytotoxic agents against multidrug-resistant cancer cells2 • Reactant for preparation of inhibitor for β-tryptase3 • Reactant for preparation of histamine H3 antagonists4 • Reactant for preparation of JNK3 MAP kinase inhibitors5 • Reactant for preparation of nucleosides6