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Cyclocondensation of activated ortho-chloroarylacetylenes with hydrazine: a novel route to substituted indazoles

✍ Scribed by Sergey F. Vasilevsky; Tat’yana A. Prikhod’ko

Book ID
111729816
Publisher
Royal Society of Chemistry
Year
1996
Tongue
English
Weight
106 KB
Volume
6
Category
Article
ISSN
0959-9436

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✍ Abraham Thomas; Manjaree Chakraborty; Hiriyakkanavar Ila; Hiriyakkanavar Junjapp 📂 Article 📅 1990 🏛 Elsevier Science 🌐 French ⚖ 745 KB

Cyclocondensation of 3-aminopyrazole (la) and 3-amino-5-methylthio-4-phenylpyrazole (lb) withac-oxoketene dithioacetals (2a-2) derived from acyclic active methylene ketones affordF5-methylthio-6.7-substituted pyraxzo [l,5-alpyrimidines (3-d) exclusively. The reaction was found to be equally successf