Organocatalytic 1,4-conjugate addition of ascorbic acid to α,β-unsaturated aldehydes: bio-inspired total syntheses of leucodrin, leudrin and proposed structure of dilaspirolactone
作者:Zhaofeng Wang、Kun Zhao、Junkai Fu、Junlin Zhang、Weiyu Yin、Yefeng Tang
DOI:10.1039/c3ob00046j
日期:——
The organocatalytic additions of ascorbic acid to various α,β-unsaturated aldehydes via tandem 1,4-conjugate addition/hemiacetalization/hemiketalization were developed, which provided a rapid entry into the 5-5-5 spirodilactone cores of a family of ascorbylated natural products. Based on the described chemistry, total syntheses of leucodrin, leudrin and the proposed structure of dilaspirolactone were achieved.
通过串联1,4-共轭加成/半缩醛化/半缩酮化,开发了抗坏血酸对各种α,β-不饱和醛的有机催化加成方法,为合成一类具有5-5-5螺二内酯核的抗坏血酸盐天然产物提供了一条快速途径。基于所描述的化学反应,实现了白藜芦素、勒维丁和提出的二螺二酚内酯结构的全程合成。