作者:Ian S.C. King、David W. Knight
DOI:10.1016/j.tet.2020.131871
日期:2021.2
A new synthesis of the dihydrothieno [2,3-c]furan Kahweofuran, isolated from coffee extracts, reveals it probably does not possess the intense and ‘violent’ sulfurous odour previously ascribed to it. We speculate that trace amounts of thiol compound(s) present as impurities in the original isolate and perhaps in other synthetic samples are instead responsible. Key steps in the present approach are
该二氢的新合成[2,3- Ç ]呋喃Kahweofuran,从咖啡提取物中分离,表明它可能不会不具有以前所赋予的激烈,“暴力”硫磺气味。我们推测,痕量的硫醇化合物作为杂质存在于原始分离物中,也许还存在于其他合成样品中,是造成这种情况的原因。本方法的关键步骤是通过5-内切-碘化环化来建立呋喃环,以及最终的高效铜催化的中间体3-碘呋喃分子内C-S键形成。