Palladium-Catalyzed Allylation of Pronucleophiles with Alkynes at 50 °C – Remarkable Effect of 2-(Dicyclohexylphosphanyl)-2′-(dimethylamino)biphenyl as Ligand
Lewis acid catalyzed intramolecular halo-arylation of tethered alkenes using N-halosuccinimide (NXS) as the halogen source: a general method for the synthesis of chromanones, chromans, quinolones, tetrahydroquinolines and tetralins
作者:Saumen Hajra、Biswajit Maji、Ananta Karmakar
DOI:10.1016/j.tetlet.2005.09.170
日期:2005.12
Lewis acid catalyzed intramolecular halo-arylation of tethered alkenes was performed using N-halosuccinimide (NXS) as the halogen source. Among the Lewis acids investigated, Sm(OTf)3 was found to be the best catalyst. This catalytic process provides a general method for the regio- and stereoselective synthesis of annulated arene heterocycles and carbocycles such as 2-chromanones, chromans, 2-quinolones
Asymmetric aminoarylation for the synthesis of trans-3-amino-4-aryltetrahydroquinolines: An access to aza-analogue of dihydrexidine
作者:Sk Md Samim Akhtar、Sukanta Bar、Saumen Hajra
DOI:10.1016/j.tet.2021.132257
日期:2022.1
A proficient stereoselective aminoarylation reaction of N-cinnamylanilines, based on a two-step protocol of catalytic enantioselective aziridination and subsequent 6-endo-tet Friedel-Crafts cyclization, has been developed and demonstrated. A pair of chiral bis-oxazoline ligand and Cu(OTf)2 offered an effective combination in the synthesis of trans-3-amino-4-aryltetrahydroquinolines with excellent diastereo-
A Convenient and Efficient Route for the Allylation of Aromatic Amines and α-Aryl Aldehydes with Alkynes in the Presence of a Pd(0)/PhCOOH Combined Catalyst System
作者:Nitin T. Patil、Huanyou Wu、Isao Kadota、Yoshinori Yamamoto
DOI:10.1021/jo0485684
日期:2004.12.1
The allylation of aromatic amines with alkynes proceeded smoothly in the presence of catalytic amounts of Pd(PPh3)(4) and benzoic acid. The allylation products were obtained in high yields in a regio- and stereoselective manner. The effect of various groups on the nitrogen atom of anilines was studied. Regardless of the substituent (electron withdrawing or electron donating) on the aromatic ring, the reaction proceeded well. Various functionalities, including -CH3, -OMe, -Cl, -CN, -COOMe, -NO2 and -COCH3 were tolerated under the reaction conditions. Similarly, the allylation of alpha-aryl aldehydes proceeded well with the same level of regio- and stereoselectivity as the allylation of aromatic amines. This reaction provides the second example of the transition metal catalyzed direct alpha-allylation of aldehydes.