In unseren letzten Mittcilungcnl) z, berichteten wir iiber die dem Koffein, Theobromin und Theophyllin isomeren Pyrazolo [3,4-d]pyrimidine. In der vorliegenden Arbeit beschreiben wir nun Pyrazolo [3,4-d]pyrimidine, die in 3-und 4-Stellung Aminogruppen tragen. Ihre Herstellung war im Hinblick auf die
Heilmittelchemische Studien in der heterocyclischen Reihe. 5. Mitteilung. Pyridazine II. Eine neue Pyridazinsynthese
✍ Scribed by P. Schmidt; J. Druey
- Publisher
- John Wiley and Sons
- Year
- 1954
- Tongue
- German
- Weight
- 357 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
A new synthesis of 6‐pyridazones starting from three single components is described. The starting materials are (1) and α‐diketone, α‐ketoaldehyde or glyoxal, (2) a carbonic acid having an active methylene group in α‐position, and (3) hydrazine or a monosubstituted hydrazine.
📜 SIMILAR VOLUMES
## Abstract Using methylglyoxal as the α‐dicarbonyl component in the new pyridazine synthesis described in an earlier publication, two isomeric methyl‐5‐cyano‐pyridazones‐(6) are obtained with cyanoacetic acid hydrazide. The position of the methyl groups has been proved.
## Abstract The analgetic activity of 1,3,4‐trimethyl‐5‐cyano‐pyridazone‐(6) (I), a compound chemically similar to the pyridine‐alkaloid ricinine is discussed. Many similar derivatives have been prepared, but only pyridazones having in position 5 a cyano, in 3 and 4 alkyl, and in 1 a methyl group h
## IIELVETICA CHIMICA ACTA. % u s a m m e n f a s s u ng. Durch Untersuchungen an zwei verschicdeneri Fullkorperkolonnen konnte gezeigt werden, dass die fruher beschriebene Charaktmisicrungsgrosse C S fur eine gegebeno Ammoniak-Rbsorptionskolonne in eincr linearen Beziehung zum Mengenverhaltnis G
## Abstract It has been shown that the reaction between kojic acid and hydrazine hydrate gives rise to two main products: 3,6‐dihydroxymethyl‐4‐oxo‐1,4‐dihydro‐pyridazine, and the hydrazone of 3‐hydroxymethyl‐pyrazol‐5‐yl‐hydroxyacetaldehyde, the structures of which were proved unambiguously.
## Abstract The preparation and the properties of a number of N‐sulfanilyl‐sydnonimines are described.