Bifunctional Phosphine Ligand Enabled Gold‐Catalyzed Alkynamide Cycloisomerization: Access to Electron‐Rich 2‐Aminofurans and Their Diels–Alder Adducts
By using biphenyl-2-ylphosphines functionalized with a remote tertiary amino group as a ligand, readily available acetylenic amides are directly converted into 2-aminofurans devoid of any electron-withdrawing and hence deactivating/stabilizing substituents. These highly electron-rich furans have rarely been prepared, let alone applied in synthesis, because of their high reactivities and low stabilities
Addition of stannyl phosphines to alkynes and allenes
作者:Terence N. Mitchell、Heinz-Joachim Belt
DOI:10.1016/0022-328x(90)85241-p
日期:1990.4
Diphenyl(trimethylstannyl)phosphine adds to alkynes (both terminal and non-terminal) and allenes under free radical conditions. The former reaction occurs regiospecifically with preferential formation of E-isomers, the latter regioselectively. Product identification was based on NMR spectroscopic data. With one exception, addition to alkenes was not observed.
Synthesis of Internal gem-Diborylalkanes by Copper-Catalyzed Double Hydroboration of Conjugated Internal Alkynes
作者:Yuma Netsu、Naofumi Tsukada
DOI:10.2174/1570178614666170321114445
日期:2017.6.8
their unique reactivities. Double hydroboration of alkynes is a convenient and useful method for the synthesis of diborylalkanes. However, the double hydroboration is applied mainly to terminal alkynes. Methods: Ethyl propiolate was treated with B2pin2 and methanol in the presence of various copper catalysts and ligands. The reaction of several internal conjugated alkynes was also investigated under the
The α,β-acetylenic dithio and thiono esters and have been prepared by thiolysis of the iminium salts , by a palladium (II) catalyzed condensation of the acetylenes with the thiocarbonyl chlorides or , and by a thiocarbonylation of the magnesium acetylides with the thionocarbonyl chloride .
Palladium-catalyzedaddition of a C–Si bond in acylsilanes across the triple bonds in an alkyne bearing a carbonyl group at one terminal is reported. The reaction proceeds with excellent regioselectivity, in which a silyl group is incorporated into the carbon α to the carbonyl group, allowing for straightforward access to a variety of functionalized alkenylsilane derivatives. Catalytic synthesis of