Asymmetric synthesis catalyzed by chiral ferrocenylphosphine-transition metal complexes. 3. Preparation of optically active allylsilanes by palladium-catalyzed asymmetric Grignard cross-coupling
Trifluoromethylation of Allylsilanes under Photoredox Catalysis
摘要:
A new catalytic method to access allylic secondary CF3 products is described. These reactions use the visible light excited Ru(bpy)(3)Cl-2 center dot 6H(2)O catalyst and the Togni or Umemoto reagent as the CF3 source. The photoredox catalytic manifold delivers enantioenriched allylic trifluoromethylated products not accessible under Cu(I) catalysis.
Chirality transfer from optically active allylsilanes to π-allylpalladium complexes
作者:Tamio Hayashi、Mitsuo Konishi、Makoto Kumada
DOI:10.1039/c39830000736
日期:——
The reaction of lithium palladates with the opticallyactive allylsilanes, (E)- and(Z)-1-phenyl-1-trimethylsilyl-but-2-ene and (E)-and (z)-1-phenyl-3-trimethylsilylbut-1-ene proceeds stereospecifically [anti attack of palladium(II) with respect to the leaving silyl group] to give opticallyactiveπ-allylpalladiumcomplexes containing the η3-(1-methyl-3-phenylallyl) group in high yields.
Optically active allylsilanes. 1. Preparation by palladium-catalyzed asymmetric Grignard cross-coupling and anti stereochemistry in electrophilic substitution reactions