First Cross-Coupling Reaction of Potassium Aryltrifluoroborates with Organic Chlorides in Aqueous Media Catalyzed by an Oxime-Derived Palladacycle
作者:Emilio Alacid、Carmen Nájera
DOI:10.1021/ol802024j
日期:2008.11.6
aryltrifluoroborates are cross-coupled with aryl and heteroarylchlorides using a 4-hydroxyacetophenone oxime-derived palladacycle as precatalyst, K2CO3 as base, and TBAB as additive in refluxing water under conventional and microwave heating affording the corresponding biphenyls under phosphine-free conditions. For the arylation of allyl and benzylchlorides, KOH is used as base in acetone-water (3:2)
Hydrolytic selenoxide elimination reaction for the preparation of 2-chloro-1-olefins
作者:Lars Engman
DOI:10.1016/s0040-4039(00)95954-9
日期:——
from terminal olefins by a sequence involving Markownikoff-addition of PhSeCl, chlorination of the resulting β-chloroalkyl phenyl selenides with SO2Cl2 and, after recrystallization, hydrolysis/selenoxideelimination in a two-phase system.
Photocatalyzed reduction of diaryliodonium salts was achieved by using [Cu(dpp)2][PF6] as a photoactive complex and DIPEA as a reductive quench. The application of a copper catalyst allows the generation of aryl radicals under mild conditions and maintains their reactivity for CC bond formation processes.
Selective Ruthenium-Catalyzed Hydrochlorination of Alkynes: One-Step Synthesis of Vinylchlorides
作者:Sylvie Dérien、Hubert Klein、Christian Bruneau
DOI:10.1002/anie.201505144
日期:2015.10.5
direct and selectivealkynehydrochlorination is reported and leads to vinylchlorides in excellent yields with atom economy. The reaction proceeds at room temperature from terminal alkynes and provides a variety of chloroalkenes. Only the regioisomer resulting from the formal Markovnikov addition is selectively formed. Mechanistic studies show the stereoselective syn addition of HCl to alkynes at room
Triarylsulfonium salts are prompted to undergo efficient homolytic reduction by single electron transfer under mild photocatalytic conditions. The liberated arylradical can then participate in carbon‐carbon bond formation processes with allyl sulfones and activated olefins. Triarylsulfonium salts emerge as a valuable and alternative source of arylradicals for synthesis.