One-Pot Synthesis of N-Arylated Amines by Hydroaminomethylation of 2,5-Dihydrofuran with Aromatic Amines
作者:Lailai Wang、Zhiwen Zheng
DOI:10.1055/s-0037-1610681
日期:2019.4
of aniline and various cyclic olefins is investigated under the optimal conditions, and excellent conversion and good yields are obtained. A new efficient catalytic system for one-step synthesis of N-arylated amines, for example, an important intermediate, 4-ethyl-N-[(tetrahydrofuran-3-yl)methyl]aniline, is achieved by using different rhodium precursor and phosphorus ligands catalyzed hydroaminomethylation
Reactions of N-Alkyl-N-phenyl-1H-benzotriazole-1-methanamines with .alpha.,.beta.-Unsaturated Ethers. A Novel Route to 1,4- and 1,3-Disubstituted 1,2,3,4-Tetrahydroquinolines
作者:Alan R. Katritzky、Bogumila Rachwal、Stanislaw Rachwal
DOI:10.1021/jo00113a043
日期:1995.4
N-Alkyl-N-aryl-1H-benzotriazole-1-methanamines 3, easily accessible from the condensation of anilines with formaldehyde and benzotriazole, undergo acid-catalyzed reactions with ethyl vinyl ether to give 1-allkyl-4-(benzotriazol-1-yl)-1,2,3,4-tetrahydroquinolines 10 and their benzotriazol-2-yl isomers 11. The reaction mechanism involves formation of 1-alkyl-4-ethoxy-1,2,3,4-tetrahydroquinolines 8 as isolable intermediates, followed by substitution of the ethoxy group in 8 with benzotriazole to produce 10 and 11, Treatment with Grignard reagents in toluene converts compounds 10 and 11 in good yield to 4-alkyl- or 4-aryltetrahydroquinolines 12. 2,3-Dihydrofuran and 3,4-dihydro-2H-pyran undergo similar reaction sequences giving tetrahydroquinolines additionally substituted by 3-(beta-hydroxyethyl) and 3-(gamma-hydroxypropyl) groups, respectively. The stereochemistry of 1,3,4-trisubstituted 1,2,3,4-tetrahydroquinolines is assigned on the basis of NOE methodology. An unusual reduction of the benzotriazolyl moiety to a phenylamino group is observed in the case of product 43 obtained from the reaction of 10-(benzotriazol-1-ylmethyl)-4H-phenothiazine with ethyl vinyl ether.
A Selective and General Cobalt‐Catalyzed Hydroaminomethylation of Olefins to Amines
作者:Ji Yang、Fábio G. Delolo、Anke Spannenberg、Ralf Jackstell、Matthias Beller
DOI:10.1002/anie.202112597
日期:2022.1.10
A general and selective synthesis of amines via hydroaminomethylation of olefins in the presence of the specific Co-tert-BuPy-Xantphos catalyst is presented. This novel system is complementary to previously known noble metal catalysts and constitutes one of the most general catalysts for HAM.
介绍了在特定的 Co- tert -BuPy-Xantphos 催化剂存在下通过烯烃的氢氨基甲基化合成胺的一般选择性合成方法。这种新系统是对以前已知的贵金属催化剂的补充,是最常见的 HAM 催化剂之一。