Decarboxylative Allylation of Trifluoroethyl Sulfones and Approach to Difluoromethyl Compounds
摘要:
Ally, carbonates undergo palladium-catalyzed decarboxylative allylation of trifluoroethyl phenyl sulfones. The success of the allylation, which is not efficient under typical strong base-mediated conditions, is the result of mild conditions thanks to a progressive delivery of ethoxide. Indeed, ethyl allyl carbonates act as a latent source of ethoxide for generation of the trifluoroethyl carbanion that reacts with the pi-allylpalladium complex. The utility of the method is illustrated in a new approach to difluoromethyl compounds.
Copper‐catalyzed Si−H, B−H, P−H, S−H, and N−H insertion reactions of 2,2,2‐trifluoro‐1‐diazoethane and 1‐aryl 2,2,2‐trifluorodiazoethanes generated a large number of new fluorine‐containing chemical entities for medicinal chemists. With selected Si−H and B−H insertion reactions, we demonstrate successful extension to asymmetric catalysis.