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1978 (1)
1976 (1)
1Author    Ringverengungsreaktionen Von Chinolintrionen, Helga Wittmann, Friedrich GünzlRequires cookie*
 Title    Synthesen von Heterocyclen, CCVIII [1] Zur Chemie der vicinalen Triketone, XI [2]  
 Abstract    -lH,5H-benzo [ij] quinolizine (I) does not react with 2-aminopyridine to give a Schiff base [2], but reacts by ringcontraction to the spiro-indolone 1/1, which can be hydrolysed to l-(2-pyridyl-amino)l,2,5,6-tetrahydro-4H-pyrrolo[3,2,l-ij]quinoline-2-one (2/1). In the same way the reaction of I resp. 1-phenyl-quinolinetrione (LI) with tfert-butylamine in aliphatic alcohols yields by ringcontraction the indolone acid esters 5 a-c. Reaction of I with £er£-butylamine without solvent forms the ringcontracted amide 5c/I. 
  Reference    Z. Naturforsch. 33b, 1540—1546 (1978); eingegangen am 12. Juli 1978 
  Published    1978 
  Keywords    Quinolinetriones, Ringcontractions, 2-Aminopyridine, 2, 3-Diaminopyridine, Zerf-Butylamine l, 2, 3-Trioxo-2, 3, 6, 7-tetrahydro 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1540.pdf 
 Identifier    ZNB-1978-33b-1540 
 Volume    33 
2Author    Helga Wittmann, Hossein Taleban, Reinhard HerzogRequires cookie*
 Title    Synthesen von Heterocyclen, 199 1 Spiro-lactone aus 1.2.3-Trioxo-2.3-dihydro-phenalen sowie 2.3.4-Trioxo-1.2.3.4-tetrahydrochinolinen und Anthranilsäure The Chemistry of Vicinal Triketones, VIII 1 Spiro Lactones from l,2,3-Trioxo-2,3-dihydro-phenalene and 2,3,4-Trioxo-l,2,3,4-tetrahydro-quinolines with Anthranilic Acid  
 Abstract    l,2,3-Trioxo-2,3-dihydro-phenalene (PT) and l,2,3-trioxo-2,3,6,7-tetrahydro-l H, 5H- benzo[ij]quinolizine (TMCHi) react with anthranilic acid (AS) primarily to give the spirolactones la-lb, which are thermically rearranged to the corresponding benzoxazine carboxylic acids 2 a - 2 b . l-phenyl-2,3,4-trioxo-l,2,3,4-tetrahydro-quinoline (PHCHi) reacts with AS yielding the spirolactone 1 c, which decomposes upon heating. 
  Reference    (Z. Naturforsch. 31b, 1407—1409 [1976]; eingegangen am 5. Juli 1976) 
  Published    1976 
  Keywords    Anthranilic Acid, l, 2, 3-Trioxo-2, 3-dihydro-phenalene, 2, 3, 4-Trioxo-l, 2, 3, 4-tetrahydro-quinoline, Spirolactone, Benzoxazine Carboxylic Acid 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1407.pdf 
 Identifier    ZNB-1976-31b-1407 
 Volume    31