Pyrimidin‐2‐yl sulfonates, as a reaction partner, can be easily prepared from inexpensive commercial materials and are efficiently cross‐coupled with arylboronic acids and terminal alkynes by using Pd(OAc)2‐catalyzed Suzuki and Sonogashira reactions. A wide array of C2‐functionalized pyrimidines have been prepared in good to excellent yields. 2‐Arylpyridines and 2‐(oct‐1‐ynyl)pyridine were also synthesized.

The straightforward visible-light-induced synthesis of stilbene compounds via the cross-coupling of nitroalkenes and diazonium tetrafluoroborates under transition-metal-free conditions is described. The protocol uses green LEDs as light sources and eosin Y as an organophotoredox catalyst. Broad substrate scope and exclusive selectivity for the (E)-configuration of stilbenes are observed. This protocol proceeds via a radical pathway, with nitroalkenes serving as the radical acceptor, and the nitro group is cleaved during the process.

No abstract

The molecular iodine-catalyzed threecomponent reaction of amides or amide derivatives, paraformaldehyde and styrenes allows for the clean generation of allylamine derivatives in good yields and high regioselectivities. The reaction, forming water as the sole co-product, is an experimentally easy to conduct transformation in the absence of transition metals under mild conditions.