Reactivity of Heterocyclic Enaminones: Regioselective Synthesis of Polyfused Indolones
摘要:
Photocyclization of heterocyclic enaminones to give partial hydrogenated derivatives of indolo[2,3-c]quinoline, pyrido[2,3-c]carbazole, and pyrido[4,3-a]carbazole is described: In addition, 3-[(5'-quinolinyl)-benzylamino]cyclohex-2-en-1-one and 3 -[(8'-quinolinyl) benzylamino]cyclohex-2-en-1-one undergo C-N bond cleavages and a benzyl migration on the C-6 and C-7 positions respectively.
Palladium-Catalyzed Microwave-Assisted Amination of 1-Bromonaphthalenes and 5- and 8-Bromoquinolines
作者:Tammy Wang、David R. Magnin、Lawrence G. Hamann
DOI:10.1021/ol034072h
日期:2003.3.1
1-Aminonaphthalenes and 5- and 8-aminoquinolines were rapidly prepared from the respective aryl bromides in good yields by Pd-catalyzed aryl amination under microwave conditions. Consistent improvements in yields over those obtained under standard conditions were seen with quinoline substrates. In the cases where 5-bromo-8-cyanoquinoline was used as a substrate, no desired products were obtained under standard conditions with a number of different primary and secondary amines. However, microwave conditions provided the desired products in good to excellent yields.
Ligand-free Iron(II)-Catalyzed N-Alkylation of Hindered Secondary Arylamines with Non-activated Secondary and Primary Alcohols <i>via</i>
a Carbocationic Pathway
作者:Onkar S. Nayal、Maheshwar S. Thakur、Manoranjan Kumar、Neeraj Kumar、Sushil K. Maurya
DOI:10.1002/adsc.201701183
日期:2018.2.15
Secondary benzylic alcohols represent a challenging class of substrates for N‐alkylation of amines. Herein, we describe an iron(II)‐catalyzed eco‐friendly protocol for N‐alkylation of secondary arylamines with secondary benzyl alcohols through a carbocationic pathway instead of the known borrowinghydrogen transfer (BHT) approach. Transiently generated carbocations, produced from alcohols via self‐condensation
Photocyclization of heterocyclic enaminones to give partial hydrogenated derivatives of indolo[2,3-c]quinoline, pyrido[2,3-c]carbazole, and pyrido[4,3-a]carbazole is described: In addition, 3-[(5'-quinolinyl)-benzylamino]cyclohex-2-en-1-one and 3 -[(8'-quinolinyl) benzylamino]cyclohex-2-en-1-one undergo C-N bond cleavages and a benzyl migration on the C-6 and C-7 positions respectively.