Search

Over the past few years, transition metal-mediated oxidative cross-coupling reactions have emerged as a versatile method to construct C–C bonds. However, most of the precedents require high-priced precious metal catalysts such as Rh, Pd, and Ru in combination with a stoichiometric amount of metal oxidant including copper and silver salt. Recently, stoichiometric copper or silver salt-mediated oxidative C–H/C–H cross-coupling reactions in the absence of high-priced metal catalyst have shown up prominently. This short review covers the latest progress in the applications of this emerging strategy, highlights their advantages and limitations, and provides a comprehensive overview on existing procedures and employed methodologies. [ABSTRACT FROM AUTHOR]

As 3-aza-1,5-enynes, internal and terminal alkyne-bearing tertiary enamides underwent an efficient Au(I)-catalyzed 6- endo - dig cyclization reaction to afford a variety of di- to penta-substituted 1,2-dihydropyridine derivatives in high yields. The cyclization proceeds through a cascade comprising an intramolecular nucleophilic addition of enaminic carbon to alkyne–gold(I) complex, deprotonation, and protodeauration steps. Au(I)-catalyzed tertiary enamide–alkyne cyclization coupled with consecutive oxidative aromatization provided a straightforward route to polysubstituted pyridines. [ABSTRACT FROM AUTHOR]

Abstract: The first example of an AIE active BF2dbm derivative with a single dimethylamino group connecting to the phenyl ring was revealed. It also showed capability of sensing HCl gas both in solution and in the solid state. [Copyright &y& Elsevier]