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Synthesis of 3-nitro-4-amino- and 3,4-diamino-1-thiacoumarins

✍ Scribed by V. L. Savel'ev; T. G. Afanas'eva; V. A. Zagorevskii


Book ID
112331484
Publisher
Springer US
Year
1976
Tongue
English
Weight
76 KB
Volume
12
Category
Article
ISSN
0009-3122

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Synthesis of 1-methyl-, 4-nitro-, 4-amin
✍ Y. C. Fiamegos; G. A. Pilidis; G. Varvounis 📂 Article 📅 2001 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 44 KB

## Abstract 4‐Aminopyrazole‐3‐ones **4b, e, f** were prepared from pyrazole‐3‐ones **1b‐d** in a four‐step reaction sequence. Reaction of the latter with methyl __p__‐toluenesulfonate gave 1‐methylpyrazol‐3‐ones **2b‐d**. Compounds **2b‐d** were treated with aqueous nitric acid to give 4‐nitropyraz