Dual ligand-promoted palladium-catalyzed nondirected C–H alkenylation of aryl ethers
作者:Biao Yin、Manlin Fu、Lei Wang、Jiang Liu、Qing Zhu
DOI:10.1039/d0cc00940g
日期:——
DirectC-H functionalization of aryl ethers remains challenging owing to their low reactivity and selectivity. Herein, a novel strategy for nondirected C-Halkenylation of aryl ethers promoted by a dual ligand catalyst was demonstrated. This catalytic system readily achieved the highly efficient alkenylation of alkyl aryl ethers (anisole, phenetole, n-propyl phenyl ether, n-butyl phenyl ether and benzyl
The invention provides compounds of formula (I)
wherein R
1
, R
3
, L
1
, L
2
, G
1
, G
2
, A and m are as defined in the specification and optical isomers, racemates and tautomers thereof, and pharmaceutically acceptable salts thereof; together with processes for their preparation, pharmaceutical compositions containing them and their use in therapy. The compounds are inhibitors of microsomal prostaglandin E synthase-1.
Heck Vinylations Using Vinyl Sulfide, Vinyl Sulfoxide, Vinyl Sulfone, or Vinyl Sulfonate Derivatives and Aryl Bromides Catalyzed by a Palladium Complex Derived from a Tetraphosphine
affords an efficient catalyst for the Heck reaction ofsulfur-containing alkenes with aryl bromides. The rates and yields of the reactions strongly depend on the oxidation state of the sulfur atom. Using vinyl sulfides with 1 mol% catalyst, low to moderate yields of arylated alkenes were obtained. Phenyl vinyl sulfoxide was found to be more reactive, and satisfactory yields of (E)-[2-(phenylsulfinyl)vinyl]benzene