Reaction of isocyanates with pyrazol-5-ones

Treatment of mono- and diisocyanates with 3-methyl-4-alkyl(aryl)pyrazol-5-ones by heating in absolute dioxane gives the corresponding 1-carbamoylpyrazol-5-ones. Using PMR spectroscopy it has been shown that they exist in the 5-hydroxypyrazole form in DMSO, dimethylacetamide, chloroform, or acetone solutions.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1058–1060, August, 1990.     

Reaction of acyl isocyanates with pyridine

Conclusions The trichloroacetyl and trifluoroacetyl isocyanates react with pyridine to give N-(1-pyridinocarbonyl)trichloro(trifluoro)acetyl amidates, while ditrichloro(trifluoro)acetylcarbodiimides are formed in the presence of 3-phenyl-1-ethyl-3-phospholene 1-oxide, which add to the C = N bond of pyridine on the type of 1,4-cycloaddition.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 927–928, April, 1977.     

Reaction of acyl isocyanates with 3-formylcamphor

Conclusions Benzoyl and trichloroacetyl isocyanates react with 3-formylcamphor to form only the O-addition, products.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 472–473, February, 1985.     

Reaction between alcohols and alkyl isocyanates catalyzed by the light-sensitive ferrocene-ferric chloride system.

Kinetic, spectroscopic and quantum yield measurements allow insight into the mechanism of the reaction between t-butyl isocyanate and methanol photosctalyzed by ferrocene and ferric chloride.     

Reaction of acyl isocyanates with pyridine derivatives

Conclusions Trichloroacetyl isocyanate reacts with 2- and 4-picolines to form substituted trichloroacetylamidates. Benzoyl isocyanate forms a dimer in the presence of picolines. Depending on the nature of the solvent, trichloroacetyl isocyanate adds to 4-vinylp'yridine either at the vinyl group or at the ring nitrogen atom.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2127–2130, September, 1984.     

Reaction of 1,3-dehydroadamantane with organic isocyanates

Russian Journal of Organic Chemistry -     

A New and Convenient Synthesis of Substituted Acylthioacylureas. Reaction of aryl and alkyl thioamides with acyl isocyanates

The addition of acyl isocyanates to a solution of aryl and alkyl thioamides affords substituted acylthioacylureas. The IR. spectra of substituted acylthioacylureas is described.     

Reaction of acyl isocyanates with β-keto esters

Conclusions Acyl isocyanates react with- keto esters to give both O- and C-addition products. The O-addition products subsequently rearrange to the thermodynamically more stable C-addition products.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1344–1349, June, 1980.     

Reaction of benzoyl and trichloroacetyl isocyanates with quinoline

Conclusions Trichoroacetyl isocyanate under the influence of quinoline forms ditrichloroacetylcarbodiimide, which adds to the C=N bond of quinoline on the type of a 2+4-cycloaddition. Benzoyl isocyanate under the influence of quinoline forms the dimer.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No.2, pp.456–458, February, 1973.     

Unambiguous structure of the compounds in the reaction of L-tryptophan and 5-hydroxy-l-tryptophan with alkyl isocyanates in acetone

On the basis of X-ray crystallographic analysis, it is shown that the reaction of L-tryptophan and 5-hydroxy-L-tryptophan with alkyl isocyanates in acetone affords, in agreement with Claesson's work, 3-alkylcarbamoyl-4-(3-indolylmethyl)-1,3-oxazolidin-5-ones 2 and not 2-[(3-alkyl-4,4-dimethyl-2-oxo)-1,3-diazetidinyl]-3-(3-indolyl)propionic acids 1 as previously proposed.     

Reaction of acyl(aroyl) isocyanates with dimedon

Conclusions The benzoyl and trichloroacetyl isocyanates react with dimedon to give the [4 + 2]-cycloadducts and the O- and C-addition products, whereas trifluoroacetyl isocyanate reacts to give the acid azomethine.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2788–2790, December, 1981.     

Reaction of N-vinylimidazoles with alkyl halides

Quaternary salts of N-vinylimidazole and N-vinylbenzimidazole were synthesized. The structures of the products of quaternization of the N-vinylimidazoles were proved by IR and UV spectra. The distribution of the -electron density in the N-vinylimidazole molecules was obtained by quantum-chemical calculation.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 958–960, July, 1971.