Reaction of ethoxymethylenemalonate with cyanothioacetamide in the presence of triethylamine: formation of 1,5-diamino-2,4-dicyano-5-thioxopenta-1,3-diene-1-thiolate and unexpected aminomethylation result
The reaction of cyanothioacetamide with ethoxymethylenemalonate and triethylamine in ethanol upon heating is non-selective and leads to the formation of a mixture of triethylammonium 1,5-diamino-2,4-dicyano-5-thioxopenta-1,3-diene-1-thiolate and triethylammonium 6-oxo-3-cyano-5-ethoxycarbonyl-1H-pyr...
Wedi'i Gadw mewn:
| Prif Awduron: | , |
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| Fformat: | Статья |
| Iaith: | English |
| Cyhoeddwyd: |
Pleiades Publishing
2020
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| Pynciau: | |
| Mynediad Ar-lein: | https://dspace.ncfu.ru/handle/20.500.12258/12161 |
| Tagiau: |
Ychwanegu Tag
Dim Tagiau, Byddwch y cyntaf i dagio'r cofnod hwn!
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| Crynodeb: | The reaction of cyanothioacetamide with ethoxymethylenemalonate and triethylamine in ethanol upon heating is non-selective and leads to the formation of a mixture of triethylammonium 1,5-diamino-2,4-dicyano-5-thioxopenta-1,3-diene-1-thiolate and triethylammonium 6-oxo-3-cyano-5-ethoxycarbonyl-1H-pyridin-2-thiolate with a predominance of the latter. When treating with primary amines and 37% formalin in boiling aqueous alcohol, the reaction product gives only 4-(1,3,5-thiadiazinan-2-ylidene)-2-(3,4-dihydro-2H-1,3,5-thiadiazin-6-yl)pent-2-enedinitrile instead of the expected pyrido[2,1-b][1,3,5]thiadiazine derivatives. Triethylammonium 6-oxo-3-cyano-5-ethoxycarbonyl-1H-pyridin-2-thiolate does not react under these conditions |
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