- CARBON TRANSFER REACTIONS OF Δ2-OXAZOLINIUM AND THIAZOLINIUM CATIONS
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Δ2-Oxazolinium and thiazolinium cations with or without an appendage at any of the heteroatoms transfer their C(2) units at the carboxylic acid oxidation level to binucleophiles and provide the corresponding heterocycles, thus mimicking carbon transfer reactions exhibited by THF models, N-methyl N'-tosyl/acetyl imidazolinium cations.However, these azolinium cations react with phenethylamine and tryptamine to furnish their N-acyl derivatives.
- Singh, Harjit,Sarin, Rakesh
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p. 1449 - 1460
(2007/10/02)
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- Derives de la dihydro-2,4 triazole-1,2,4 thione-3 et de l'amino-2 thiadiazole-1,3,4 a partir de nouvelles thiosemicarbazones d'esters
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A new general synthesis of 4,5-disubstituted 2,4-dihydro-1,2,3-triazole-3-thiones is proposed.These heterocycles are obtained by the action of primary amines, aralhydrazines or aroylhydrazines on the thiosemicarbazones of esters.These last compounds are prepared by action of chlorhydrates of iminoesters on thiosemicarbazide in dimethylformamide.These thiosemicarbazones react also with strong acids, acid anhydrides and chlorides; by thermolysis and they give 2-amino-1,3,4-thiadiazole derivatives.Also, two derivatives of 1,2,4-triazolo-1,3,4-thiadiazole have been prepared.
- Malbec, Frederique,Milcent, Rene,Barbier, Geo
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p. 1689 - 1698
(2007/10/02)
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- Δ2-OXAZOLINIUM AND THIAZOLINIUM CATIONS AS ONE CARBON UNIT TRANSFER AGENTS
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N-Methyl-Δ2-oxazolinium and thiazolinium cations tranfer their C2 units to binucleophiles in refluxing DMF or CH3CN and provide the corresponding heterocycles.
- Singh, Harjit,Sarin, Rakesh
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p. 1101 - 1104
(2007/10/02)
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