It has been established that a cationicrhodium(I)/(R)‐tol‐binapcomplex catalyzes the cross‐cyclotrimerization of silylacetylenes, di‐tert‐butyl acetylenedicarboxylates, and acrylamides with excellent chemo‐, regio‐, and enantioselectivities. Unsymmetrical alkynoates can also be employed in place of di‐tert‐butyl acetylenedicarboxylate for this process, but with reduced chemoselectivity.
Metal‐Catalyst‐Free One‐Pot Aqueous Synthesis of <i>trans</i>‐1,2‐Diols from Electron‐Deficient <i>α</i>,<i>β</i>‐Unsaturated Amides via Epoxidation Using Oxone as a Dual Role Reagent
First general one-pot direct trans-dihydroxylation of electron-deficient α,β-unsaturatedamides was developed. Trans-1,2-diols were produced, rather than cyclizing nitrogen-containing heterocycles by using inorganic oxone as a dual-role reagent in water. This reaction allowed operational simplicity, switchable selectivity, broad substrate scope, no metal pollution and organic waste generation.
efficient electrochemical Ni-catalyzed alkene hydrogenation is described. The reaction features outstanding substrate generality and functional group compatibility, and distinct chemoselectivity. Notably, hydrodebromination of alkyl and aryl bromides can be realized using the same reaction system with a different ligand, and high chemoselectivity between hydrogenation of alkene and hydrodebromination could
A novel visible-light-induced radical cascade bromocyclization of N-arylacrylamides has been accomplished. This reaction overcomes the overbromination at the benzene rings suffered in traditional electrophilic reactions, thus enabling the first highly chemoselective synthesis of valuable 3-bromomethyloxindoles. The combination of pyridine and anhydrous medium is identified as the key factor for the