SCHEDULED MAINTENANCE
4 Heterocyclic chemistry
Abstract
It has been a busy and productive year in the arena of heterocyclic chemistry. Particular highlights include the first report of high enantioselectivity achieved in an oxaziridinium-mediated epoxidation, a catalytic asymmetric aziridination procedure which uses simple sulfonamides as nitrene precursors, two new catalysts for the enantioselective [2 + 2] cycloaddition of ketenes with aldehydes to form β-lactones, a multicomponent coupling of imines, alkynes and acyl chlorides to give pentasubstituted pyrroles with control of regiochemistry, a catalytic asymmetric aza-Diels–Alder reaction yielding chiral dihydropyridones, and a remarkable zirconocene-catalysed reaction of a bis-alkynylsilane with three equivalents of nitrile to give fused pyridines.
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