| 2 | Author
| H. Möhrle, J. Mehrens | Requires cookie* | | Title
| Reaktivität nitrophenylsubstituierter cyclischer Amine bei Dehydrierungen The Reactivity of Nitrophenyl Substituted Cyclic Amines with Dehydrogenations  | | | Abstract
| Piperidine and perhydroazepine bearing a 1 -(4-nitrophenyl) substituent were inert to mercury-edta, while the a-pipecoline derivative gave an aminoketone with cleavage of the heterocycle. However the corresponding (2-nitrophenyl) compounds reacted to give respectively a piperidin-2-one, an aminopentanal and an aminohexanone. By an additional substituent in 2'-position the p-nitro compounds underwent dehydrogenation too. With a methyl group resulted a pattern analogous to o-nitro products. A neighbouring hydroxymethyl function enhanced the reaction with formation of benzoxazines and if possible their further oxidized derivatives, the hydroxylactams. | | |
Reference
| (Z. Naturforsch. 53b, 37 [1998]; eingegangen am 8. Oktober 1997) | | |
Published
| 1998 | | |
Keywords
| Lactam, Iminium Salt, Aminoketone, N, 0-Acetal, Neighbour Group | | |
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| default:Reihe_B/53/ZNB-1998-53b-0037.pdf | | | Identifier
| ZNB-1998-53b-0037 | | | Volume
| 53 | |
3 | Author
| H. Möhrle, U. Von Der Lieck-Waldheim | Requires cookie* | | Title
| Vinamidinium-Salze als Nucleophile Vinamidinium Salts as N ucleophiles  | | | Abstract
| 1,4-diazepinium salts could not be aminomethylated with conventional methods, but the hydrochlorides produced with methyleniminium salts the C-Mannich-compounds. The reactivity of the substrate was mainly controlled by electronic effects of the substituents. Aminomethylation of 1,5-diazapentadienium salts occurred only if the conformations caused no steric hindrance of the ß-C-atom. Methyl substituted 2,3-dihydro-1,4-diazepinium salts reacted with 1,3,5 triazine to pyrimidine anellated derivatives. | | |
Reference
| Z. Naturforsch. 51b, 421—430 (1996); eingegangen am 4. Juli 1995 | | |
Published
| 1996 | | |
Keywords
| Mannich Reaction, Iminium Salts, 1, 3, 5 Triazine, Push-Pull-Systems 2, 3-Dihydro- | | |
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| default:Reihe_B/51/ZNB-1996-51b-0421.pdf | | | Identifier
| ZNB-1996-51b-0421 | | | Volume
| 51 | |
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