Synthetic applications of homoiodo allylsilane II. Total syntheses of (−)-andrographolide and (+)-rostratone
作者:Hai-Tao Gao、Bian-Lin Wang、Wei-Dong Z. Li
DOI:10.1016/j.tet.2014.10.015
日期:2014.12
The first total synthesis of (−)-andrographolide (1), an ent-Labdane diterpenoid lactone from Asian medicinal herb Andrographis paniculata, was achieved via the biomimetic cyclization of an epoxy homoiodo allylsilane precursor 7. Asymmetric total synthesis of (+)-rostratone (25), an antipodal Labdane diterpenoid, was also accomplished via similar biomimetic cyclization of a readily accessible epoxy
(-)-穿心莲内酯(1),从亚洲草药Andrographis paniculata的对-Labdane二萜类内酯的第一个全合成,是通过环氧同碘代烯丙基硅烷前体7的仿生环化而实现的。不对称的(+)-rostratone(25),对映的Labdane二萜类化合物的全合成,也可以通过类似的仿生环化,容易获得的环氧同碘烯丙基硅烷前体18来完成。