Zinc-Acetic Acid Reductive Cyclisation in a Two-Step Synthesis of the S1-N10 Nine-Membered Lactone Core of<i>ent-</i>Griseoviridin
作者:Louis Ricard、Janick Ardisson、Grégory Chaume、Carine Kuligowski、Sophie Bezzenine-Laffolée、Ange Pancrazi
DOI:10.1055/s-2004-834899
日期:——
The synthesis of the S1-N10 nine-membered lactone core 28 of ent-griseoviridin is reported. Starting from cystine derivative 25, encompassing a terminal ynoate, treatment under Zn/ AcOH conditions led to the formation of lactone 28 in 12% yield. Therefore, the lactone moiety of ent-griseoviridin is obtained in 10.7% overall yield for two steps. An access to the corresponding 5-epi-griseoviridin lactone
报道了 ent-griseoviridin 的 S1-N10 九元内酯核心 28 的合成。从胱氨酸衍生物 25 开始,包括末端乙炔酸酯,在 Zn/AcOH 条件下处理导致以 12% 的产率形成内酯 28。因此,通过两步获得 ent-griseoviridin 的内酯部分的总产率为 10.7%。还描述了获得相应的 5-表灰葡萄苷内酯 29。