1567353-98-3Relevant academic research and scientific papers
A remarkable regiocontrol in the palladium-catalyzed silylstannylation of fluoroalkylated alkynes-highly regio- and stereoselective synthesis of multi-substituted fluorine-containing alkenes
Konno, Tsutomu,Kinugawa, Ryoko,Ishihara, Takashi,Yamada, Shigeyuki
, p. 1611 - 1617 (2014)
On treating fluorine-containing internal alkynes with 1.2 equiv. of (trimethylsilyl)tributyltin in the presence of 2.5 mol% of Pd(PPh 3)2Cl2 in THF at the reflux temperature for 6 h, the silylstannylation reaction proceeded smoothly to afford the corresponding silylstannylated adducts in high yields in a highly regio- and cis-selective manner. Switching the palladium catalyst from Pd(PPh3) 2Cl2 to Pd(t-BuNC)2Cl2 promoted the formation of silylstannylated adducts with opposite regioselectivity. The thus obtained silylstannylated adducts were subjected to Stille cross-coupling reactions to furnish the corresponding fluoroalkylated vinylsilanes whose C-Si bond was converted to a C-C bond by treating with aldehyde in the presence of TBAF and Zn(OTf)2, the corresponding fluoroalkylated tetra-substituted alkenes being afforded in moderate to good yields with a defined stereochemistry. The Royal Society of Chemistry 2014.
