Penarolide sulfate A2, a 31-membered macrolide encompassing a proline residue and three sulfate groups, was firstly synthesized in 16 linear steps with 4.8% overall yield. Three consecutive stereogenic centers in penarolide sulfate A2 were efficiently derived from natural chiral template L-arabinose. The crucial assembly reactions included Brown asymmetric allylation, olefin cross-metathesis, alkyne-epoxide
首先以16个线性步骤合成
硫酸戊环内酯A 2(31位大环内酯,其中包含脯
氨酸残基和三个
硫酸基),总收率为4.8%。
硫酸戊环内酯A 2中三个连续的立体异构中心有效地衍生自天然手性模板
L-阿拉伯糖。关键的组装反应包括布朗不对称烯丙基化,烯烃交叉复分解,
炔烃-环氧偶联和大内酰胺化。检验了戊
戊内酯硫酸盐A 2及其完全脱
硫的衍
生物的抗酵母α-
葡萄糖苷酶活性,IC 50值分别为4.87和10.74μgmL -1。