Preparation of Benzolactams by Pd(OAc)2-Catalyzed Direct Aromatic Carbonylation
摘要:
We developed a new method for Pd(II)-catalyzed direct aromatic carbonylation in a phosphine-free catalytic system using Pd(OAc)2 and Cu(OAc)2 in an atmosphere of CO gas containing air. The carbonylation proceeded with ortho-palladation, inducing a remarkable site selectivity to afford a variety of five- or six-membered benzolactams from secondary omega-arylalkylamines, such as N-alkylbenzylamines or N-alkylphenethylamines.
react with various aromatic aldehydes in the absence of any catalyst, solid support, or solvent, to give imines after a reaction time of eight minutes under microwave irradiation by a clean and very efficient process (yields: 75-100%). In the case of volatile amine, methylamine, 1,3-dimethylurea dispersed on montmorillonite Kl 0 is used as an amine precursor to prepare the corresponding imines.
IMIDAZAOLONE DERIVATIVES,PREPARATION THEREOF AND BIOLOGICAL USE OF SAME
申请人:Carreaux Francois
公开号:US20100216855A1
公开(公告)日:2010-08-26
Imidazolone derivatives, as medicaments, of formula
wherein:
R
1
═H, C
1
to C
5
alkyl, aryl or a 5- or 6-membered heterocyclic group;
Ar
1
=optionally substituted aryl or an aromatic heterocycle;
R═R
2
—S—, R
3
—HN—, R
4
COHN or Ar
2
, with
R
2
=a C
1
-C
5
alkyl, vinyl or vinyl(C
1
-C
5
)alkyl, nitrile or nitrile(C
1
-C
5
)alkyl, aryl or benzyl radical, which are optionally substituted;
R
3
=the meanings given above and H;
Ar
2
=substituted or unsubstituted aryl.
A Practical Approach to New (5Z) 2-Alkylthio-5-arylmethylene-1-methyl-1,5-dihydro-4H-imidazol-4-one Derivatives
作者:Khadidja Bourahla、Ludovic Paquin、Olivier Lozach、Laurent Meijer、François Carreaux、Jean Pierre Bazureau
DOI:10.3390/molecules16097377
日期:——
A practical protocol for the preparation of (5Z)-2-alkylthio-5-arylmethylene-1-methyl-1,5-dihydro-4H-imidazol-4-one derivatives is reported. The new compounds were obtained in good yield and stereoselectivity in two steps, namely a solvent-free Knoevenagel condensation under microwave irradiation, followed by an S-alkylation reaction with various halogenoalkanes.
A Convenient Stereoselective Method for Synthesis of β-Lactams Under Microwave Irradiation with [BmIm] OH as a Reusable Ionic Liquid
作者:Souhila Bendeddouche、Choukry K. Bendeddouche、Hadj Benhaoua
DOI:10.2174/1570178618666210901142356
日期:2021.12
A promoted synthetic protocol for the β-lactams synthesis in the presence of [BmIm]OH as a basic reagent under microwaveirradiation [M.W.I.] is described. The reaction was highly diastereoselective. In all cases, this protocol provided trans-β-lactams as major isomers, and β-lactams were obtained with good yields. Further, the effect of the order of addition of the reagents was particularly investigated;
A Combined Experimental and Theoretical Study of the Polar [3 + 2] Cycloaddition of Electrophilically Activated Carbonyl Ylides with Aldehydes and Imines
作者:Ghenia Bentabed-Ababsa、Aicha Derdour、Thierry Roisnel、Jose A. Sáez、Patricia Pérez、Eduardo Chamorro、Luis R. Domingo、Florence Mongin
DOI:10.1021/jo8027104
日期:2009.3.6
nzylamine) proceed diastereoselectively. The effect of microwave irradiation on the outcome of the reaction was studied. The mechanism of these [3 + 2] cycloaddition reactions has been theoretically investigated using DFT methods. These cycloadditions, which have one-step mechanisms, consist of the nucleophilic attack of the aldehyde oxygen or imine nitrogen on the carbonyl ylide. For the reaction