Synthesis of Some New 6,8-Disubstituted 7,8-Dihydropyrimido[2,3:4,3]pyrazolo[1,5-a]pyrimidines and 6,7,8-Trisubstituted Pyrimido[2,3:4,3]Pyrazolo[1,5-a]Pyrimidine Derivatives
Тип публикации: Journal Article
Дата публикации: 2003-04-01
scimago Q3
wos Q3
БС2
SJR: 0.337
CiteScore: 3.4
Impact factor: 1.5
ISSN: 00094536, 21926549
General Chemistry
Краткое описание
Cyclization of 5-cyano-1,6-dihydro-4-methyl-2-phenyl-6-thioxopyrimidine 4 with excess of 85% hydrazine hydrate afforded the 3-amino-4-methyl-6-phenylpyrazolo[3,4-d]pyrimidine 5, which can react with appropriate Mannich base derivatives 13a-c and chalcones 27a,b to yield the corresponding 6,8-disubstituted 7,8-dihydropyrimido[2,3:4,3]pyrazolo[1,5-a]pyrimidines 15a-c and 30a,b, respectively. On the other hand, the 6,7,8-trisubstituted pyrimido[2,3:4,3]pyrazolo[1,5-a]pyrimidine derivatives 8a-g, 20a-e, 36 and 38 were obtained by treatment of compound 5 with appropriate 1,3-diketones 6a-g, 3-dimethylamino-1-(substituted)prop-2-enones 18a-e, 3-aminocrotononitrile 3, and ethoxymethylenemalononitrile 37 under acidic condition, respectively.
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Ho Y., Yao C. T. Synthesis of Some New 6,8-Disubstituted 7,8-Dihydropyrimido[2,3:4,3]pyrazolo[1,5-a]pyrimidines and 6,7,8-Trisubstituted Pyrimido[2,3:4,3]Pyrazolo[1,5-a]Pyrimidine Derivatives // Journal of the Chinese Chemical Society. 2003. Vol. 50. No. 2. pp. 283-296.
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Ho Y., Yao C. T. Synthesis of Some New 6,8-Disubstituted 7,8-Dihydropyrimido[2,3:4,3]pyrazolo[1,5-a]pyrimidines and 6,7,8-Trisubstituted Pyrimido[2,3:4,3]Pyrazolo[1,5-a]Pyrimidine Derivatives // Journal of the Chinese Chemical Society. 2003. Vol. 50. No. 2. pp. 283-296.
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TY - JOUR
DO - 10.1002/jccs.200300043
UR - https://doi.org/10.1002/jccs.200300043
TI - Synthesis of Some New 6,8-Disubstituted 7,8-Dihydropyrimido[2,3:4,3]pyrazolo[1,5-a]pyrimidines and 6,7,8-Trisubstituted Pyrimido[2,3:4,3]Pyrazolo[1,5-a]Pyrimidine Derivatives
T2 - Journal of the Chinese Chemical Society
AU - Ho, Yuh-Wen
AU - Yao, Chia Tseng
PY - 2003
DA - 2003/04/01
PB - Wiley
SP - 283-296
IS - 2
VL - 50
SN - 0009-4536
SN - 2192-6549
ER -
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@article{2003_Ho,
author = {Yuh-Wen Ho and Chia Tseng Yao},
title = {Synthesis of Some New 6,8-Disubstituted 7,8-Dihydropyrimido[2,3:4,3]pyrazolo[1,5-a]pyrimidines and 6,7,8-Trisubstituted Pyrimido[2,3:4,3]Pyrazolo[1,5-a]Pyrimidine Derivatives},
journal = {Journal of the Chinese Chemical Society},
year = {2003},
volume = {50},
publisher = {Wiley},
month = {apr},
url = {https://doi.org/10.1002/jccs.200300043},
number = {2},
pages = {283--296},
doi = {10.1002/jccs.200300043}
}
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Ho, Yuh-Wen, and Chia Tseng Yao. “Synthesis of Some New 6,8-Disubstituted 7,8-Dihydropyrimido[2,3:4,3]pyrazolo[1,5-a]pyrimidines and 6,7,8-Trisubstituted Pyrimido[2,3:4,3]Pyrazolo[1,5-a]Pyrimidine Derivatives.” Journal of the Chinese Chemical Society, vol. 50, no. 2, Apr. 2003, pp. 283-296. https://doi.org/10.1002/jccs.200300043.