In Situ Construction of (NiCo)Se Nanobeads Embedded in N-Doped Carbon 3D Interconnected Networks for Enhanced Sodium Storage.

Transition metal selenides, boasting remarkable specific capacity, have emerged as a promising electrode material. However, the substantial volume fluctuations during sodium ion insertion and extraction result in inadequate cyclic stability and rate performance, impeding their practical utility. Here, we synthesized N-doped carbon three-dimensional (3D) interconnected networks encapsulating (NiCo)Se nanoparticles, denoted as ((NiCo)Se/N-C), exhibiting a bead-like structure and carbon confinement through electrospinning and subsequent thermal treatment.

Concise Total Synthesis of (-)-Quinocarcin Enabled by Catalytic Enantioselective Reductive 1,3-Dipolar Cycloaddition of Secondary Amides.

A concise asymmetric total synthesis of (-)-quinocarcin has been accomplished with high step economy from commercially available starting materials. A catalytic enantioselective reductive 1,3-dipolar cycloaddition reaction of N-heteroaryl secondary amides with reactive dipolarophiles using iridium/copper relay catalysis was developed to prepare the key chiral pyrrolidine intermediate with three stereocenters. This protocol features excellent regio-, exo- and enantioselectivities, broad substrate scope, and good functional group tolerance.

Chemoselective Reactions of Isocyanates with Secondary Amides: One-Pot Construction of 2,3-Dialkyl-Substituted Quinazolinones.

A facile method for the preparation of 2,3-dialkyl-substituted quinazolinones from readily available -arylamides and commercial isocyanates was developed. This one-pot procedure involves the chemoselective activation of the secondary amide with TfO/2-Br-Pyr, the sequential addition of isocyanate, and cyclization. The mild reaction is general for a wide range of substrates and can be run on a gram scale.