Redox-neutral photocatalytic cyanomethylation/cyclization cascade of olefinic amides: Access to cyanomethylated benzoxazines

Visible-light-mediated selenocyclization of o-vinylanilides with diselenides

Herein, we describe a visible-light-mediated selenocyclization of o-vinylanilides with diselenides, which provides a mild and effective method for the synthesis of selenylated 4H-3,1-benzoxazines. This reaction proceeds under metal-free conditions, without the need for a chemical oxidant or a controlled O2 atmosphere and shows a broad substrate scope with yields of up to 98%. Additionally, the process is easily scalable to the gram scale.

Synthesis of 2,4-Dicyanoalkylated Benzoxazines through the Radical-Mediated Cascade Cyclization of Isocyanides with AIBN under Metal- and Additive-Free Conditions

A general and novel method for the radical cascade cyclization of aryl isocyanides with AIBN has been described. This strategy provides straightforward access to various 2,4-dicyanoalkylated benzoxazines in moderate to good yields under metal- and additive-free conditions. The reaction can apply to a gram scale and tolerate diverse functional groups. 2,4-Dicyanoalkylated benzoxazine derivatives feature a large Stokes shift and intramolecular charge transfer properties.