Interligand Interactions Dictate the Regioselectivity of<i>trans</i>-Hydrometalations and Related Reactions Catalyzed by [Cp*RuCl]. Hydrogen Bonding to a Chloride Ligand as a Steering Principle in Catalysis
作者:Stephan M. Rummelt、Karin Radkowski、Dragoş-Adrian Roşca、Alois Fürstner
DOI:10.1021/jacs.5b01475
日期:2015.4.29
mode in the presence of [Cp*Ru(MeCN)3]PF6 (1) as the catalyst; however, the regioselectivity is often poor with unsymmetrical substrates. This problem can be solved upon switching to a catalyst comprising a [Ru-Cl] bond, provided that the acetylene derivative carries a protic functional group. The R3M unit is then delivered with high selectivity to the alkyne-C atom proximal to this steering substituent
On the [2,3]-sigmatropic rearrangements of sulfenate esters derived from alkenynols: synthesis of vinylallene and vinylacetylene sulfoxides.
作者:Eugène M.G.A. van Kruchten、William H. Okamura
DOI:10.1016/s0040-4039(00)87011-2
日期:1982.1
The reactions of various alkenynols with phenylsulfenyl chloride result in the formation of either vinylallene sulfoxides or vnylacetylene sulfoxides, depending on the substitution pattern of the starting material.
Ruthenium-Catalyzed Allylation-Cyclization Reactions of Cyclic 1,3-Dicarbonyl Compounds with 1-Vinyl Propargyl Alcohols
作者:Anita Jonek、Stefanie Berger、Edgar Haak
DOI:10.1002/chem.201202414
日期:2012.11.26
Ruthenium‐catalyzed allylation–cyclization reactions of cyclic 1,3‐dicarbonyl compounds with 1‐vinyl propargyl alcohols that lead to diverse carbo‐ or heterocyclic products in a one‐pot cascade process are reported. These mechanistically distinct reactions are catalyzed by a single ruthenium(0) complex that contains a redox‐coupled dienone ligand. The reaction pathway strongly depends on the substrate
Cyclization of arylhydrazones of cross-conjugated enynones: synthesis of luminescent styryl-1<i>H</i>-pyrazoles and propenyl-1<i>H</i>-pyrazoles
作者:Radik N. Itakhunov、Ivan S. Odin、Dmitry M. Gusev、Stanislav A. Grabovskiy、Kareem V. Gordon、Anna V. Vologzhanina、Sergey A. Sokov、Ilya M. Sosnin、Alexander A. Golovanov
DOI:10.1039/d2ob01427k
日期:——
5-disubstituted pent-1-en-4-yn-1-ones with arylhydrazines in acidified alcohol results mainly in the formation of the corresponding arylhydrazones with traces of the side products of cyclization at the double bond – 1,5-diaryl-3-(arylethynyl)-4,5-dihydro-1H-pyrazoles (pyrazolines). Arylhydrazones are cyclized only by refluxing in high-boiling polar solvents (DMF and ethylene glycol), with the selective formation
1,5-二取代的 pent-1-en-4-yn-1-ones 与芳基肼在酸化酒精中的缩合主要导致相应的芳基腙的形成,在双键处有痕量的环化副产物 – 1,5 -二芳基-3-(芳基乙炔基)-4,5-二氢-1 H-pyrazoles (pyrazolines). Arylhydrazones are cyclized only by refluxing in high-boiling polar solvents (DMF and ethylene glycol), with the selective formation of 1,5-disubstituted 3-styrylpyrazoles in up to 77–95% yields. Thermodynamically, the cyclization of arylhydrazones at the triple bond is the
Wender, Paul A.; Stemmler, Rene T.; Sirois, Lauren E., Journal of the American Chemical Society, 2010, vol. 132, p. 2532 - 2533
作者:Wender, Paul A.、Stemmler, Rene T.、Sirois, Lauren E.