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Synthesis of [1,2,4]Triazolo[4,3-a]pyrimidin-7(8H)-one Derivatives by Nucleophilic Substitution of the Methylmercapto Group in 4-Hydroxy-6-methyl-2-methylthiopyrimidine

✍ Scribed by V. A. Yanchenko; A. N. Gur'eva; A. R. Khairulin; A. M. Demchenko

Book ID: 110406534
Publisher: Springer US
Year: 2002
Tongue: English
Weight: 105 KB
Volume: 38
Category: Article
ISSN: 0009-3122
DOI: 10.1023/a:1021277803841

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## Abstract The reaction of 1,2‐dihydro‐6‐(phenylamino)‐2‐thioxopyrimidin‐4(3__H__)one (**16**) with __N__‐arylhydrazonoyl halides **15** in CHCl~3~ in the presence of Et~3~N under reflux afforded the corresponding 1,2,4‐triazolo[4,3‐__a__]pyrimidin‐5‐ones of type **20** in good yields (__Scheme 3_