A Synthetic Approach to the Furanocembrane Carbon Skeleton by a Regioselective Bromine-Magnesium Exchange Reaction
作者:Thorsten Bach、Christoph Stock、Frank Höfer
DOI:10.1055/s-2004-837229
日期:——
The dibromofuran 6 was prepared in four steps from di-bromofurfural 3 in 73% yield. It was regioselectively metalated by a bromine-magnesium exchange reaction and was added to aldehyde 7. Alcohol 8 was obtained by this key step in 75% yield. Further functionalization reactions led to the precursors 17-19 for an intramolecular Nozaki-Hiyama coupling. The ring-closing Nozaki-Hiyama protocol was successfully
二溴呋喃 6 由二溴呋喃 3 分四步制备,产率为 73%。它通过溴-镁交换反应进行区域选择性金属化,并加入到醛 7 中。通过这一关键步骤以 75% 的收率获得醇 8。进一步的官能化反应产生了用于分子内 Nozaki-Hiyama 偶联的前体 17-19。在大环炔丙醇 20 的合成中成功实施了闭环 Nozaki-Hiyama 协议。