作者:Jinshan Li、Chuanfang Zhao、Jun Liu、Yuguo Du
DOI:10.1016/j.tet.2015.04.025
日期:2015.6
efficient total synthesis toward spiroketal diastereomers of cephalosporolides H and I was achieved, respectively, taking advantage of intramolecular Wacker-type spiroketalization on the common olefin-containing dihydroxy-γ-lactone substrate. By comparing the physical data of natural products with synthetic samples, we suggest that the reported stereochemical assignments for cephalosporolides H and I are
利用常见的含烯烃的二羟基-γ-内酯底物上的分子内Wacker型螺酮金属化,分别实现了对头孢类内酯H和I的螺酮非对映异构体的有效全合成。通过将天然产物的物理数据与合成样品进行比较,我们建议报道的头孢类内酯H和I的立体化学分配不正确。我们的工作表明,应该将核心螺环骨架C-6上的立体化学从其原来的R分配修改为S,并应重新考虑这些天然化合物的真实结构。