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Molecules 2001, 6(7), 621-638; doi:10.3390/60700621
Article

Heterocyclic o-Aminonitriles: Preparation of Pyrazolo[3,4-d]-pyrimidines with Modification of the Substituents at the 1- Position

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Received: 19 February 2001 / Revised: 4 June 2001 / Accepted: 7 June 2001 / Published: 30 June 2001
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Abstract

Novel 1-[6-(p-tolyl) pyridazin-3-yl]pyrazole-o-aminonitriles (3a-c) were formed using 3-hydrazino-6-(p-tolyl)pyridazine (2) and ketene S,S-acetals (1a), S,Nacetals (1b) or tetracyanoethylene (1c). The pyrazole-o-aminonitriles (3a-c) were in turn used as precursors for the preparation of previously unreported 1-[6-(p-tolyl)-pyridazin-3-yl]pyrazolo[3,4-d]pyrimidines (8, 9, 13-20) and 7-[6-( p-tolyl) pyridazin-3-yl]2-arylpyrazolo[3,4-d]1,2,4-triazolo[5,1-f]pyrimidines (10-12) which are expected to possess considerable chemical and pharmacological activities.
Keywords: ο-Aminonitriles; ketene acetals; pyrazolopyrimidines ο-Aminonitriles; ketene acetals; pyrazolopyrimidines
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Al-Afaleq, E.I.; Abubshait, S.A. Heterocyclic o-Aminonitriles: Preparation of Pyrazolo[3,4-d]-pyrimidines with Modification of the Substituents at the 1- Position. Molecules 2001, 6, 621-638.

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