作者:George D. Hartman、Wasyl Halczenko、John D. Prugh、Theresa M. Williams
DOI:10.1002/jhet.5570270336
日期:1990.3
An efficient synthetic route is reported for the preparation of thieno[2,3-e]furan-2-sulfonamides bearing oxygenated functionality at C-5. The method employs conversion of furan-3-carboxaldehyde to an intermediate that, in the key step, undergoes facile cyclodehydration to the fused [5,5] heterocycle under mild Knoevenagel conditions.
据报道,一种有效的合成路线可用于制备在C-5带有氧化官能团的噻吩并[2,3 - e ]呋喃-2-磺酰胺。该方法采用呋喃-3-甲醛转化为中间体,该中间体在关键步骤中在温和的Knoevenagel条件下易于环化脱水成稠合的[5,5]杂环。