Synthesis of heterocyclic systems with a carbohydrate fragment
作者:A. V. Samet、A. L. Laichter、D. N. Reznikov、A. N. Yamskov、B. I. Ugrak、N. B. Chernyshova、V. V. Yolkin、V. V. Semenov
DOI:10.1007/bf01558084
日期:1994.6
Levoglucosenone, the alpha,beta-unsaturated ketone obtained by the pyrolysis of cellulose, reacts with NH-azoles in the presence of bases. In this process not only normal Michael adducts are formed, but in some cases their hydrates (gem-diols) are also formed. In all cases the addition proceeds stereospecifically and with good yields. 3-Nitro-s-triazole, 3-nitro-and 4-nitropyrazoles, 3-methyl-4-nitropyrazole, 5-nitrotetrazole, 4,5-dicarbomethoxy-nu-triazole, 3,4-dinitropyrazole, 3(5)-methylpyrazole, pyrazole, and imidazole have been studied in this reaction. All of the adducts are characterized by NMR- and IR-spectroscopy.