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
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[,:4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidines 9a, 9b, respective...
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Wiley
2013-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2013/696579 |
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| author | Yuh Wen Ho Se Long Chou |
| author_facet | Yuh Wen Ho Se Long Chou |
| author_sort | Yuh Wen Ho |
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| description | 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[,: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[,: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[,: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[,: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. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2013-01-01 |
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| spelling | doaj-art-49ba9ddef5044b999b7a507174ab80ac2025-02-03T07:25:22ZengWileyJournal of Chemistry2090-90632090-90712013-01-01201310.1155/2013/696579696579Thioxopyrimidine in Heterocyclic Synthesis II: Novel Synthesis of Some Triazoles and Triazepine Derivatives with a Pyrimido[3,2:4,5]thieno[2,3-d]pyrimidine SkeletonYuh Wen Ho0Se Long Chou1Department of Creative Fashion Design, Taoyuan Institute of Innovation Technology, Jhongli 32091, TaiwanDepartment of Creative Fashion Design, Taoyuan Institute of Innovation Technology, Jhongli 32091, TaiwanCondensation 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[,: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[,: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[,: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[,: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.http://dx.doi.org/10.1155/2013/696579 |
| spellingShingle | Yuh Wen Ho Se Long Chou 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 |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| url | http://dx.doi.org/10.1155/2013/696579 |
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