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- W2010163722 abstract "4-Arylamino-5,6,7,8-tetrahydro-1H-pyrazolo[3,4-b]quinolines 2 have been synthesized from ethyl 5-amino-1H-pyrazole-4-carboxylate (1) and cyclohexanone by heating in a reagent mixture of P4O10, N,N-dimethylcyclohexylamine, and an appropriate arylamine hydrochloride (8 – 52% yield). Reaction of 2 with formaldehyde and secondary amines afforded the Mannich bases 3 in 45 – 94% yield. Attempts to prepare the 5,6,7,8-dehydrogenated analogues of 2 using a previously adopted method failed.Phosphorpentoxid in der Organischen Synthese, XXIX. – Synthese von 4-Arylamino-5,6,7,8-tetrahydro-1H-pyrazolo[3,4-b]chinolinen und entsprechenden N-Mannich-Basen4-Arylamino-5,6,7,8-tetrahydro-1H-pyrazolo[3,4-b]chinoline 2 lassen sich aus 5-Amino-1H-pyrazol-4-carbonsaure-ethylester (1) und Cyclohexanon durch Erhitzen in einer Mischung aus P4O10, N,N-Dimethylcyclohexylamin und einem geeigneten Arylamin-hydrochlorid herstellen (8 – 52% Ausbeute). Umsetzung von 2 mit Formaldehyd und sekundaren Aminen ergibt die Mannich-Basen 3 zu 45 – 94%. Versuche, die Verbindungen 2 in den Positionen 5,6,7 und 8 nach einer fruher benutzten Methode zu dehydrieren, scheiterten." @default.
- W2010163722 created "2016-06-24" @default.
- W2010163722 creator A5045696911 @default.
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- W2010163722 date "1986-10-14" @default.
- W2010163722 modified "2023-09-25" @default.
- W2010163722 title "Phosphorus Pentoxide in Organic Synthesis, XXIX. Synthesis of 4-Arylamino-5,6,7,8-Tetrahydro-1H-Pyrazolo[3,4-b]Quinolines and the Corresponding N-Mannich Bases" @default.
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- W2010163722 doi "https://doi.org/10.1002/jlac.198619861006" @default.
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