Photocatalyzed cascade oxidative annulation of propargylamines and phosphine oxides
作者:Zheng-Guang Wu、Xiao Liang、Jie Zhou、Lei Yu、Yi Wang、You-Xuan Zheng、Yu-Feng Li、Jing-Lin Zuo、Yi Pan
DOI:10.1039/c7cc02433a
日期:——
intermediate propargylamine serving as a new type of radical acceptors incorporating with P-radical via a photocatalytic strategy. This reaction proceeds through a cascade phosphinoylation/cyclization/oxidation/aromatization pathway using readily available starting materials under mild conditions of light with excellent atom economy, catalyzed by AgOAc or fac-Ir(ppy)3. One of the phosphorylated quinolines
Hydrogen-Borrowing Amination of Secondary Alcohols Promoted by a (Cyclopentadienone)iron Complex
作者:Xishan Bai、Francesco Aiolfi、Mattia Cettolin、Umberto Piarulli、Alberto Dal Corso、Luca Pignataro、Cesare Gennari
DOI:10.1055/s-0039-1690101
日期:2019.9
(HB) amination has been expanded to secondaryalcohols, which had previously been reported to react only in the presence of large amounts of co-catalysts. A range of cyclic and acyclic secondaryalcohols were reacted with aromatic and aliphatic amines giving fair to excellent yields of the substitution products. The catalyst was also able to promote the cyclization of diols bearing a secondary alcohol
[bmim]PF6/CuBr: a novel and recyclable catalytic system for the synthesis of propargyl amines
作者:Jhillu S. Yadav、Basi V. Subba Reddy、Veerjala Naveenkumar、Ramisetti Srinivasa Rao、Kommu Nagaiah
DOI:10.1039/b312785k
日期:——
A novel and efficient method has been developed for the synthesis of propargyl amines in a one-pot operation from aldehydes, amines and alkynes by using copper(I) bromide immobilized in ionic liquids. The ionic liquid containing catalyst can be recovered and recycled in three to four subsequent runs with gradual decrease in activity
A pyridine-bis(oxazoline) ligand was efficiently immobilized by copper(I)-catalyzed azide-alkyne cycloaddition onto a polystyrene resin. The so obtained click-pybox resin 1a was associated with various metal salts (YbCl3, LuCl3, CuOTf) and the resulting resin-bound catalysts were explored in ring-opening of cyclohexene oxide, silylcyanation of benzaldehyde and alkynylation of imines. These new polymer-supported
The stereoselective addition of phenyl acetylene and alkyl acetylenes to imines, catalyzed by chiral bis-imines-Cu(I) complexes was studied. A very simple experimental procedure allowed to obtain at room temperature optically active propargyl amines in very good yields and enantioselectivity up to 81%.