- Synthesis of unsymmetrical ureas and S-thiocarbamates under catalyst-free conditions in a [BMIM]BF4 ionic liquid
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Unsymmetrical ureas and Sthiocarbamates were prepared in good to excellent yields by direct condensation of phenylurea with amines and thiols in 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) without the addition of any additives. The [BMIM]BF4 ionic liquid is a mild medium and can be recycled and reused several times.
- Hosseinzadeh, Rahman,Tajbakhsh, Mahmood,Aghili, Nora
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p. 175 - 182
(2015/05/27)
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- New heterocyclic polymers with vicinal parabanic structures
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The paper deals with the study of heterocyclization via the cyclocondensation reaction of some reactive polymers by using oxalyl chloride. A few polymers and model compounds were synthesized by the polyaddition reaction of some isocyanates and hydrazine.
- Scortanu, Elena,Prisacariu, Cristina
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experimental part
p. 969 - 974
(2011/06/21)
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- Migration of an acyl group in the pyrazole system: Synthesis of 1-acyl-3-hydroxy-1H-pyrazoles and related derivatives. A new preparation of N,N′-diacylhydrazines
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A new general method for the synthesis of 1-acyl-3-hydroxy-1H-pyrazoles 5a-f and related derivatives 5g-i starting from 4-ethoxymethylene-2-phenyloxazol-5(4H)-one (1) and hydrazides, 4-phenylsemicarbazide, 4-phenylthiosemicarbazide and benzyl carbazate in boiling dioxane is described. The method includes a migration of an acyl or related unit. The X-ray study and NMR spectroscopic examination confirmed the structure of the products. A one-pot synthesis of N,N′-diacylhydrazines from hydrazides by the assistance of oxazolone 1 is also presented.
- Kepe, Vladimir,Pozgan, Franc,Golobic, Amalija,Polanc, Slovenko,Kocevar, Marijan
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p. 2813 - 2816
(2007/10/03)
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- Reactions with Diazoazoles, VIII. - Syntheses of Azolo-1,2,3,5-tetrazin-4(3H)-ones
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Azolo-1,2,3,5-tetrazin-4(3H)-ones 4 and 5 are formed by cycloaddition reactions of α-diazoazoles 2 with aryl or alkyl isocyanates 3a-p, respectively, as well as with diisocyanates 3q,r (Method A).Alternative syntheses for 4 are presented by diazoti
- Ege, Guenter,Gilbert, Karlheinz,Maurer, Kurt
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p. 1375 - 1396
(2007/10/02)
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- Ketene-S,N-acetals as Synthons for Heterocycles New Synthesis of Pyrimidinones
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Ketene-S,N-acetals of type 1, 2 reacted with isocyanates to 5-cyano-uracils 3 and 5-cyano-pyrimidin-2-ones 4,5.Reaction of these with N nucleophiles was investigated furnishing 6-amino-pyrimidinones 6 as well as condensed pyrimidin-2-ones 7-10 and 13.Cyan
- Gelbin, Michael,Martin, Dieter
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p. 753 - 766
(2007/10/02)
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