- 2-(pyrazol-4-yl)-1,3-oxaselenolanes from pyrazole carbaldehydes and 2-selanyl-1-ethanol
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Pyrazole carbaldehydes react with 2-selanyl-1-ethanol at room temperature in the presence of trimethylchlorosilane followed by treatment C with triethyl amine to afford the corresponding 2-(pyrazol-4-yl)-1,3-oxaselenolanes. The structure of the novel compounds was confirmed by IR, 13 C, 1 H, 15N, and 77 Se NMR spectroscopy.this article online at wileyonlinelibrary.com.
- Papernaya, Lyubov K.,Shatrova, Alexandra A.,Levanova, Ekaterina P.,Albanov, Alexandr I.,Klyba, Lyudmila V.,Rudyakova, Elena V.,Levkovskaya, Galina G.
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- Diazirines as potent electrophilic Nitrogen sources: Application to the synthesis of Pyrazoles
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Even after more than 50 years since its discovery, the electrophilic potential of diazirines was never truly exploited. This longstanding limitation has been resolved. N-Monosubstituted diaziridines and hydrazones are obtained by nucleophilic additions. They release, under hydrolysis conditions, the corresponding monosubstituted hydrazines. The latter were converted to pyrazoles in high yields. The adamantanone can be recovered in 80-100% yields. This work demonstrates the potential of diazirines as electrophilic nitrogen sources with recoverable protecting groups.
- Schneider, Yoann,Prévost, Julie,Gobin, Ma?lle,Legault, Claude Y.
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supporting information
p. 596 - 599
(2014/04/03)
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- Synthesis of heterocyclic compounds from 4-formylpyrazoles
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Formylation of pyrazole and 2,5-dimethylpyrazole gave a number of pyrazole-containing aldehydes, which can be used to obtain chromenes, tetrahydrochromenes, 1,4-dihydropyrano[2,3-c]pyrazoles, pyrano[3,2-c]chromenes, thiochromeno[4,3-b]pyrans, pyrano[3,2-c
- Mortikov,Rodinovskaya,Fedorov,Shestopalov,Belyakov
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p. 443 - 456
(2015/02/02)
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