Enantioselective total synthesis of colomitides and their absolute configuration determination and structural revision
作者:Hongguang Yang、Xiaoyu Liu、Xiaoyu Li、Xiang Shi、Feilong Yang、Xiaozhen Jiao、Ping Xie
DOI:10.1039/c7ob00539c
日期:——
of the proposed colomitides and their possible diastereomers. Comparison of their 1H and 13C NMR spectra and specific rotations with those of the natural product revealed that the structure of colomitide A should be revised to 1c, and that the absolute stereochemistries of colomitides A and B are 2′R,4R,5R,8S,1R and 2′R,4S,5R,8S,1R.
报道了一种有效的立体选择性合成方法,用于糖胺类化合物2,7-二氧杂双环[3.2.1]辛烷型天然产物。关键步骤是立体控制的羟醛反应和金催化的环异构化。该合成策略已应用于拟定的秋水飞蓟肽及其可能的非对映异构体的首次不对称全合成。其比较1个H和13与天然产物的C NMR谱和比旋光揭示colomitide A的结构应修改为1C,并且colomitides A和B的绝对立体化学是2' - [R,4 - [R , 5 R,8 S,1 R和2'R,4小号,5 - [R 8小号,1 - [R 。