Thioxopyrimidine in Heterocyclic Synthesis II : Novel Synthesis of Some Triazoles and Triazepine Derivatives with a Pyrimido[3,2:4,5]thieno[2,3-d]pyrimidine Skeleton
Joint Authors
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-12-03
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
Condensation of ethoxymethyleneamino-thieno[2,3-d]pyrimidines 4 with appropriate amino compounds afforded the corresponding 7-substituted-8-imino-pyrimido[3,2:4,5]thieno[2,3-d]pyrimidines 6a, 6b, and 7 and 2-substituted-pyrimido[3′,2′:4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidines 9a, 9b, respectively.
Also, hydrazinolysis of compound 4 in ethanol which yielded the key intermediate 7-amino-8-imino-pyrimido[3,2:4,5]thieno[2,3-d]pyrimidine (10), which can be cyclized with appropriate isothiocyanates 14a–14g in refluxing pyridine, afforded the corresponding 2-(substituted-amino)-pyrimido[3′,2′:4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyramidines 15a–15g.
Furthermore, intramolecular cyclization of compound (10) with appropriate 1,3-dibromopropane and Mannich bases 18a–18c under the basic condition afforded the corresponding (tri)dihydropyrimido[3′,2′:4,5]thieno[3,2:4,5]pyrimido[1,6-b][1,2,4]triazepines 16 and 18a–18c, respectively.
On the other hand, the 11-substituted-pyrimido[3′,2′:4,5]thieno[3,2:4,5]pyrimido[1,6-b][1,2,4]triazepines 21a–21e were also obtained by the intramolecular cyclization of compound (10) with appropriate enaminone derivatives 19a–19e under the acidic condition.
American Psychological Association (APA)
Ho, Yuh Wen& Chou, Se Long. 2012. Thioxopyrimidine in Heterocyclic Synthesis II : Novel Synthesis of Some Triazoles and Triazepine Derivatives with a Pyrimido[3,2:4,5]thieno[2,3-d]pyrimidine Skeleton. Journal of Chemistry،Vol. 2013, no. 2013, pp.1-12.
https://search.emarefa.net/detail/BIM-491374
Modern Language Association (MLA)
Ho, Yuh Wen& Chou, Se Long. Thioxopyrimidine in Heterocyclic Synthesis II : Novel Synthesis of Some Triazoles and Triazepine Derivatives with a Pyrimido[3,2:4,5]thieno[2,3-d]pyrimidine Skeleton. Journal of Chemistry No. 2013 (2013), pp.1-12.
https://search.emarefa.net/detail/BIM-491374
American Medical Association (AMA)
Ho, Yuh Wen& Chou, Se Long. Thioxopyrimidine in Heterocyclic Synthesis II : Novel Synthesis of Some Triazoles and Triazepine Derivatives with a Pyrimido[3,2:4,5]thieno[2,3-d]pyrimidine Skeleton. Journal of Chemistry. 2012. Vol. 2013, no. 2013, pp.1-12.
https://search.emarefa.net/detail/BIM-491374
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-491374