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- W1495175752 abstract "Abstract Treatment of ethyl (heteroalkylidene)aminopyrazole-4-carboxylates with hydrazine hydrate generally provides a ready synthetic route to 5-amino-4, 5-dihydropyrazolo [3,4-d] pyrimidin-4-ones, although ethyl 5-[(dimethylamino) alkylidene]aminopyrazole-4-carboxylates are unreactive. On the other hand, reactions between aminopyrazole-4-carboxhydrazides and orthoesters or amide acetal are more versatile : we observed formation of isomeric 2-pyrazolyl-1,3,4-oxadiazoles, as major compounds, either from triethyl orthoacetate and 1-methyl-5-aminopyrazole-4-carboxhydrazide or from dimethylacetamide dimethyl acetal and various heterocyclic precursors. The ring closure mechanism is discussed." @default.
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- W1495175752 date "1987-01-01" @default.
- W1495175752 modified "2023-09-27" @default.
- W1495175752 title "Synthesis of 5-amino-4,5-dihydropyrazolo [3,4-d] pyrimidin-4-ones and related isomeric systems" @default.
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- W1495175752 doi "https://doi.org/10.1016/s0040-4020(01)83460-8" @default.
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