Thiazole C-nucleosides. III. Synthesis of pyranose analogues of tiazofurin
作者:Lajos Kovács、Pál Herczegh、Gyula Batta、István Farkas
DOI:10.1016/s0040-4020(01)80985-6
日期:1991.7
5-tri-0-acetyl-2,6-anhydro-L-mannono-and-D-gulonothioamides (5, 6) has been achieved from the corresponding nitriles. The Hantzsch reaction of (5) or (6) with ethyl bromopyruvate afforded the expected thiazoles (7.8) only in a low yield along with furan derivatives (9-11), the formation of which is rationalized by an acid-catalysed rearrangement-elimination process. The some Hantzsch reaction in the presence