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Studies on mechanisms of the rearrangement of thieno[3,2-e][1,2,4]triazolo[4,3-c]pyrimidines into thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidines

✍ Scribed by E. V. Vorob’ev; M. E. Kletskii; V. V. Krasnikov; V. V. Mezheritskii; D. V. Steglenko

Book ID
106520336
Publisher
Springer
Year
2006
Tongue
English
Weight
646 KB
Volume
55
Category
Article
ISSN
1573-9171

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## Abstract Some new 1,2,3‐triazolo[4,5‐__e__]‐1,2,4‐triazolo[3,4‐__c__]pyrimidmes were prepared starting from the corresponding 1,2,3‐triazolo[4,5‐__d__]pyrimidines __via__ the formation of the 1,2,4‐triazole ring. Thus suitable hydrazino derivatives 6 were condensed with triethyl orthoformate, tr

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## Abstract The 7‐chloro‐3‐(2‐chlorobenzyl)‐ and 7‐chloro‐3‐(2‐fluorobenzyl)‐1,2,3‐triazolo[4,5‐__d__]pyrimidines (**1** and **4**), by nucleophilic replacement with some hydrazides, gave the corresponding 7‐hydrazidoderivatives (**2a‐e** and **5a‐e**). These, by heating in Dowtherm, underwent an i