Transition Metal Complexes in Organic Synthesis. Part 57: Synthesis of 1-Azabuta-1,3-dienes and Application to Catalytic Complexation of Buta-1,3-dienes and Cycloalkadienes by the Tricarbonyliron Fragment
作者:Hans-Joachim Knölker、Birte Ahrens、Peter Gonser、Michael Heininger、Peter G. Jones
DOI:10.1016/s0040-4020(99)01109-6
日期:2000.4
3-dienes 5a–g were prepared and transformed to the corresponding tricarbonyliron complexes 6. The efficiency of 6 as tricarbonyliron transfer reagents and the activity of 5a–g for the catalytic complexation with either nonacarbonyldiiron or pentacarbonyliron was investigated. It was shown that the catalytic complexation with pentacarbonyliron using the azadiene 5b as catalyst in dioxane at reflux can
Inverse electron-demand aza-[4+2] cycloaddition reactions of allenamides
作者:Craig R. Berry、Richard P. Hsung
DOI:10.1016/j.tet.2004.05.117
日期:2004.8
An inverse electron-demand aza-[4+2] cycloaddition reaction of allenamides with 1-azadiene is described here. Effects of solvents on diastereoselectivity along with synthetic scopes and mechanisticinsights are illustrated. Despite some synthetic limitations, this aza-[4+2] cycloaddition does provide a useful template for the synthesis of aza-glycoside related heterocycles.
A general solution to implementing the 4.pi. participation of 1-aza-1,3-butadienes in Diels-Alder reactions: inverse electron demand Diels-Alder reactions of .alpha..beta.-unsaturated N-benzenesulfonyl imines
作者:Dale L. Boger、Annette M. Kasper
DOI:10.1021/ja00186a067
日期:1989.2
Croce, Piero Dalla; Ferraccioli, Raffaella; Rosa, Concetta La, Journal of the Chemical Society. Perkin transactions II, 1993, # 8, p. 1511 - 1515
Allylic Amines via Iridium-Catalyzed C−C Bond Forming Hydrogenation: Imine Vinylation in the Absence of Stoichiometric Byproducts or Metallic Reagents
作者:Andriy Barchuk、Ming-Yu Ngai、Michael J. Krische
DOI:10.1021/ja073018j
日期:2007.7.1
Exposure of aromatic, heteroaromatic, and aliphatic N-arylsulfonyl aldimines 1a-12a in toluene solution at 60 degrees C to 2-butyne and hydrogen at ambient pressure in the presence of a cationic iridium(I) catalyst modified by BIPHEP enables formation of reductive coupling products, allylic amines 1b-12b, in good isolated yields as single geometrical isomers (> 95:5, E:Z). The nonsymmetric alkynes 4-methyl-2-pentyne couple to imines 1b-12b under standard conditions with complete levels of regioselection. Hydrogenative coupling of 2-hexyne to imines 6a, 12a, and 13a delivers allylic amines 15b, 16b, and 18b in 10:1 regioisomeric ratios in each case. As revealed by H-2 NMR analysis, reductive coupling of 2-butyne to imine 2a under an atmosphere of elemental deuterium provides deuterio-2b, which incorporates deuterium at the vinylic position (83% H-2) and at the allylic methyl groups (5% H-2). An equal distribution of deuterium at the allylic methyl groups suggests H-D exchange at the propargylic positions of 2-butyne in advance of C-C coupling.