2-Amino ketones from osmium-catalysed oxidations of alkenes

Synthesis of α-heterosubstituted ketones through sulfur mediated difunctionalization of internal alkynes

Synthesis of α-heterosubstituted ketones was achieved through sulfur mediated difunctionalization of internal alkynes in one pot. The reaction design involves: phenyl substituted internal alkyne attacking triflic anhydride activated diphenyl sulfoxide to give a sulfonium vinyl triflate intermediate, hydrolysis to give an α-sulfonium ketone, and then substitution with various nucleophiles. This method provides a unified route to access α-amino ketones, α-acyloxy ketones, α-thio ketones, α-halo ketones, α-hydroxy ketones, and related heterocyclic structures, in a rapid fashion.

Highly regioselective intermolecular hydroacylations of enamides with salicylaldehydes

Highly regioselective intermolecular hydroacylations of enamides under rhodium catalysis with monodentate phosphane ligands are reported for the first time. The presence of MeCN facilitates this novel C-C bond formation, and the electron-deficient phosphine P(p-F-Ph)(3) has proven most effective for the direct hydroacylation of 1-vinyl-2-pyrrolidinone. Accordingly, an atom-economic synthetic route to α-amido ketones from readily available substrates has been developed.