Ni-Catalyzed Regioselective Hydroalkoxylation of Branched 1,3-Dienes
作者:Gaël Tran、Clément Mazet
DOI:10.1021/acs.orglett.9b03511
日期:2019.11.15
A highly regioselective Ni-catalyzed hydroalkoxylation of 1,3-dienes is reported. The use of a (P,N) ligand is essential in achieving high levels of selectivity. The optimized protocol operates under particularly mild conditions, it provides access to a broad range of structurallydiverse allylic ethers, and tolerates a number of sensitive functional groups.
Palladium-catalyzed cross-couplings of 1,3-butadien-2-yl species with organoindiums generated from allenylmethyl bromide and indium
作者:Sundae Kim、Dong Seomoon、Phil Ho Lee
DOI:10.1039/b823037d
日期:——
An organoindium generated from the reaction of indium with allenylmethyl bromide is an efficient nucleophile in Pd-catalyzed cross-couplings, producing 1,3-butadienes; cross-couplings followed by [4 + 2] cycloadditions gave six-membered carbocycles in a one-pot process.
All-Carbon Quaternary Centers via Ruthenium-Catalyzed Hydroxymethylation of 2-Substituted Butadienes Mediated by Formaldehyde: Beyond Hydroformylation
作者:Tomas Smejkal、Hoon Han、Bernhard Breit、Michael J. Krische
DOI:10.1021/ja904124b
日期:2009.8.5
Ruthenium-catalyzedtransferhydrogenation of 2-substituted dienes 1a-i in the presence of paraformaldehyde results in reductivecoupling at the 2-position to furnish the hydroxymethylation products 3a-i, which embody all-carbon quaternary centers. Reductivecoupling of diene 1g to paraformaldehyde under standard conditions, but employing deuterio-paraformaldehyde, 2-propanol-d(8), or both, corroborated
Nitrosocarbonyl hetero-Diels–Alder cycloaddition with 2-substituted 1,3-butadienes
作者:Robert B. Lewis、Javier Read de Alaniz
DOI:10.1016/j.tet.2016.11.046
日期:2017.7
A study of the reactivity of 2-substituted 1,3-butadienes with nitrosocarbonyl compounds in the 4+2 cycloaddition has been carried out showing that the regioselectivity involves a delicate balance of steric and electronic effects. 2-Aryl 1,3-butadienes favor the distal isomer with the magnitude of preference ranging from 4:1 to 15:1 depending on the nature of the nitrosocarbonyl group. However, when
Intermolecular Hydroamination of 1,3-Dienes To Generate Homoallylic Amines
作者:Xiao-Hui Yang、Alexander Lu、Vy M. Dong
DOI:10.1021/jacs.7b09188
日期:2017.10.11
We report a Rh-catalyzed hydroamination of 1,3-dienes to generate homoallylic amines. Our work showcases the first case of anti-Markovnikov selectivity in the intermolecular coupling of amines and 1,3-dienes. By tuning the ligand properties and Brønsted acid additive, we find that a combination of rac-BINAP and mandelic acid is critical for achieving anti-Markovnikov selectivity.