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Conversion of 4-amino-1H-1,5-benzodiazepine-3-carbonitrile to pyrazolo[3,4-d]pyrimidines, pyrimido[1,6-a]benzimidazole, and pyrazolo[3′,4′:4,5]pyrimido[1,6-a]benzimidazoles

✍ Scribed by Yoshihisa Okamoto; Isao Togo; Yoshihisa Kurasawa; Kaname Takagi

Book ID
112128435
Publisher
Journal of Heterocyclic Chemistry
Year
1986
Tongue
English
Weight
214 KB
Volume
23
Category
Article
ISSN
0022-152X

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## Abstract magnified image Pyrimido[2“,1”:5′,6′]pyrazolo[3′,4′:4,5]‐pyrimido[1,6‐__a__]benzoimidazoloe‐2,8(1__H__,7__H__)‐diones, and [1,2,4]‐triazino‐[3“,4”:5′,6′]pyrazolo[3′,4′:4,5]pyrimido[1,6‐__a__]benzimidazol‐8(7__H__)‐ones were synthesized in a good yields __via__ 1‐amino‐4‐methyl‐3,4‐dihy

Synthesis of novel pyrazolo[3,4-d]pyrida
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## Abstract magnified image 4‐Acetyl‐5‐methyl‐1‐phenyl‐1__H__‐pyrazole reacts with dimethylformamide dimethylacetal (DMF‐DMA) to afford the corresponding (__E__)1‐(5‐methyl‐1‐phenyl‐1__H__‐pyrazol‐4‐yl)‐3‐(__N,N__‐dimethylamino)‐2‐propen‐1‐one. The latter product undergoes regioselective 1,3‐dipol