The synthesis of a number of new 1H‐pyrazolo[3,4‐b]pyridine‐5‐carboxylic acid derivatives is described. Most of these compounds have either an alkoxy or a basic substituent in position 4.
Es werden die Synthesen des Thiazolyl‐(2)‐hydrazins sowie des 4‐Methyl‐, 4‐Phenyl‐ und 4.5‐Diphenyl‐thiazolyl‐(2)‐hydrazins und deren Kondensationsprodukte mit Aldehyden und Ketonen beschrieben. Die Umsetzung von l Mol. Glucose mit 2 Moll. 4‐Phenyl‐thiazolyl‐(2)‐hydrazin in Gegenwart von l Mol Hydrazinhydrat führt zu dem gelben, gut kristallisierenden Glucose‐[4‐phenyl‐thiazolyl‐(2)]‐osazon.
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