Regioselective monoepoxidation of 1,3-dienes catalysed by transition-metal complexes
作者:Dorte S. Thomsen、Birgit Schiøtt、Karl Anker Jørgensen
DOI:10.1039/c39920001072
日期:——
A procedure for regioselective monoepoxidation of mainly the less substituted double bond of 1,3-dienes with sodium hypochlorite or iodosylbenzene using various metal complexes as catalysts is presented; the results obtained are different from those found when applying the usual epoxidation reagents.
Highly Regioselective Addition of Allylstannanes to Vinyl Epoxides by Lewis Acid Mediation
作者:Yoshinori Naruta、Kazuhiro Maruyama
DOI:10.1246/cl.1987.963
日期:1987.5.5
In the presence of BF3·OEt2, reaction of allylstannanes with vinyl epoxides gives 1,2 or 1,4 addition products in good yield, depending on the substitution at the olefinic terminus. In either case regioselectivity is extremely high. The 1,2 adduct is applied to the elongation of a prenyl unit in polyprenyl compounds.
Synthesis of a New Deuterium-Labeled Phytol as a Tool for Biosynthetic Studies
作者:Angel Guerrero、Lourdes Muñoz
DOI:10.1055/s-0031-1289689
日期:2012.3
An efficient and stereoselective synthesis of a new deuterium-labeled phytol as a useful tracer in biosynthetic processes is presented. deuterium-labeled compounds - phytol - terpenoids - conjugate addition - natural products - biosynthesis
Selective epoxidation of various alkenes with molecular oxygen (O2) under mild conditions is a longstanding challenge in achieving syntheses of epoxides. Cu-based catalysts have been found to be catalytically active for selective epoxidations. However, the application of copper nanoparticles (CuNPs) for photocatalyzed epoxidations is encumbered by the instability of CuNPs in air. Herein we report that
Carbondioxide readily reacts with 1,3-butadiene monoxide in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium under ordinary pressure at 0 °C to afford vinylethylene carbonate in a quantitative yield.