Three-step regioselective synthesis of 2,3-difluorohalobenzenes using tetrafluoroethylene and buta-1,3-diene as starting building blocks

Base-promoted direct E-selective olefination of organoammonium salts with sulfones toward stilbenes and conjugated 1,3-dienes

A base-promoted direct deaminative olefination of organoammonium salts was developed. Only mediated by KO^tBu, a series of benzyl and cinnamyl ammonium salts reacted smoothly with sulfones, producing the valuable stilbenes and related 1,3-diene derivatives in good to high yields with good functional group tolerance and excellent E-selectivity. With this developed method, biologically active resveratrol and DMU-212 were also successfully prepared, which further demonstrates the practicality of this reaction.

Readily available alkylbenzenes as precursors for one-pot preparation of buta-1,3-dienes under DDQ visible-light photocatalysis in benzotrifluoride

Easily accessible alkylbenzenes are highly valuable starting materials and solvents in synthetic organic chemistry for production of pharmaceuticals, plastics, synthetic rubber, dyes, etc. Herein, by employing alkylbenzenes as precursors, an...