## Abstract The products of the condensation of o‐phenylenediamine with ethyl acetoacetate were re‐investigated. Depending on the reaction conditions, 2‐methylbenzimidazole (II), 2‐isopropenyl‐benzimidazole‐2‐one (VI) and 4,7‐dihydro‐5‐methyl‐1__H__‐2,3‐benzo‐1,4‐diazepin‐7‐one (IV) were obtained.
Benzimidazol-Derivate und verwandte Heterocyclen. IV. Die Kondensation von o-Phenylendiamin mit α-Aryl- und γ-Aryl-acetessigester
✍ Scribed by A. Rossi; A. Hunger; J. Kebrle; K. Hoffmann
- Publisher
- John Wiley and Sons
- Year
- 1960
- Tongue
- German
- Weight
- 591 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Heiiii Kingschluss zu cleiii i n Tab. 2 angrgc.b,cnen I~cnziinidazol-Derivat LXXI muss auf 210-215" erhitzt werden. Die analytischen Dateii stamiiicii aus unseren mikroanalytischen Laboratorieii (Dres. H. GYSEL und \V. PADOTVETZ) und die L.1' bsorptionsspektren ails dem physikalisch-cliemischeI1 Laboratoriuni (Dres. R . ROMF:TSCH u n d H, HURZELER). Allen diescn Herrcn danken wir fur ihrc bereitwillige Hilfe. s L;hIM.il<Y ,. 1 he synthesis of a series of l-aiiiinoalkyl-2-bciizyl-nitro-bt:nzimid~zoles is descri- bed. Many of thc 5-nitro-benzimidazoles prepared show strong analgesic activity. l-(~-Diethylamino-ethyl)-2-(p-ethox~-benzyl)-.j-nitr-o-benziniidazole (XXXVIII) is 1000 times as potent as morphine and therefore the most active analgesic known until now. I'orscliungs1aboratoric.n tlcr CIRA AI<TIENC;ESELLSCH.~I;
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