Ruthenium-catalyzed formation of pyrazoles or 3-hydroxynitriles from propargyl alcohols and hydrazines
作者:Julia Kaufmann、Elisabeth Jäckel、Edgar Haak
DOI:10.24820/ark.5550190.p010.893
日期:——
Functionalized pyrazoles are generated from secondary propragyl alcohols and hydrazines in a rutheniumcatalyzed cascade process, consisting of redox isomerization, Michael addition, cyclocondensation and dehydrogenation steps. The same bifunctional catalyst mediates the conversion of tertiary propargyl alcohols with hydrazine to 3-hydroxynitriles via anti-Markovnikov hydroamination followed by elimination
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
The transition-metal-free synthesis of sterically congested ethers and heterocycles via the stereospecific etherification and hydroamidation of α-bromocarboxamides and alkynols.