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Facile and efficient synthesis of 5, 7-disubstituted thiazolo [5,4-d] pyrimidine-4, 6 (5H, 7H)-diones

✍ Scribed by Liang Chen; Zhan Mei Li; Jie Zhou; Hong Rui Song; Bai Ling Xu

Book ID
113523415
Publisher
Chinese Electronic Periodical Services
Year
2012
Tongue
English
Weight
994 KB
Volume
23
Category
Article
ISSN
1001-8417

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## Abstract Isoxazolo[5,4‐__d__]pyrimidine‐4,6(5__H__,7__H__)diones **2a**–**2f** have been synthesized from the reaction of ethyl 5‐amino‐3‐methyl‐4‐isoxazole carboxylate (**1**) with aryl isocyanates in the presence of Keggin heteropolyacid H~3~[PW~12~O~40~] as a green solid acid catalyst at roo

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## Abstract Sixteen 5‐alkylamino‐3,6‐diaryl‐2‐thioxo‐2,3,6,7‐tetrahydrothiazolo[4,5‐d]pyrimidin‐7‐ones **4a**, **4b**, **4c**, **4d**, **4e**, **4f**, **4g**, **4h**, **4i**, **4j**, **4k**, **4l**, **4m**, **4n**, **4o**, **4p** were designed and easily synthesized via a tandem aza‐Wittig reaction