Synthesis of 5H-Pyrazino[2,3-b]indoles from Indole-2,3-dione Derivatives.
摘要:
Reaction of N-acetylindol-2,3-diones with ethylenediamines gave the dihydro-pyrazinones 11, which could, after dehydrogenation and deacetylation be transformed to the corresponding 5H-pyrazino[2,3-b]indoles 5. N,N-Dimethylaminoethylation of the anion of 5 occurred selectively in the 5-position. Thermolysis of 1-pyrazinylbenzotriazole gave pyrazino[1,2-a]-benzimidazole 33 and no 5H-pyrazino[2,3-b] indole.
Synthesis of 5H-Pyrazino[2,3-b]indoles from Indole-2,3-dione Derivatives.
摘要:
Reaction of N-acetylindol-2,3-diones with ethylenediamines gave the dihydro-pyrazinones 11, which could, after dehydrogenation and deacetylation be transformed to the corresponding 5H-pyrazino[2,3-b]indoles 5. N,N-Dimethylaminoethylation of the anion of 5 occurred selectively in the 5-position. Thermolysis of 1-pyrazinylbenzotriazole gave pyrazino[1,2-a]-benzimidazole 33 and no 5H-pyrazino[2,3-b] indole.
Über die Synthese und Reaktionen von (O-Acylaminophenyl)-glyoxylsäureamiden
作者:Albrecht Franke
DOI:10.1002/jlac.198219820420
日期:1982.4.20
Über die Synthese einer Reihe von (o-Acylaminophenyl)glyoxylsäureamiden 2 und 3 aus N-Acylisatinen 1 und den daraus zugänglichen Folgeprodukten wird berichtet. Durch Reduktion mit NaBH4 oder LiAlH4 sind o-(Acylamino)mandelsäureamide 5 oder o(Alkylamino)mandelsäureamide 7 sowie substituierte Phenethanolamine 9 zugänglich. Kondensation von 1a. 2 und 3 mit primären Aminen führt zu den Iminoverbindungen
Joshi, B. S.; Likhate, M. A.; Viswanathan, N., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1984, vol. 23, # 2, p. 114 - 116
作者:Joshi, B. S.、Likhate, M. A.、Viswanathan, N.
DOI:——
日期:——
An efficient microwave-assisted synthesis of dihydropyrazinones and bis-benzoylketones
作者:Mamun M. Hossain、Rabiul M. Islam、Sukanta K. Saha、Mohammad K. Islam
DOI:10.1016/j.tetlet.2009.12.057
日期:2010.2
Microwave-assisted modified Sandmeyer reactions of oximinoacetanilides, themselves obtained from substituted primary aromatic amines, in concentrated H2SO4 give isatins. N-Acetylisatins undergo ring cleavage and subsequent ring closing with alkanediamines in the presence of ethanol under MW irradiation to give the corresponding dihydropyrazinones in excellent yields. Modification of the reaction conditions affords bis-benzoyl ketones under MW irradiation. (C) 2009 Elsevier Ltd. All rights reserved.
FRANKE, A., LIEBIGS ANN. CHEM., 1982, N 4, 794-804
作者:FRANKE, A.
DOI:——
日期:——
JOSHI, B. S.;LIKHATE, M. A.;VISWANATHAN, N., INDIAN J. CHEM., 1984, 23, N 2, 114-116