Total Syntheses of Dichotomines A-D and the Stereochemical Revision of Dichotomines B-D
作者:Qiang Zhang、Jing Dong、Xiao-Xin Shi、Xia Lu
DOI:10.1002/ejoc.201200235
日期:2012.6
New asymmetric total syntheses of (–)-dichotomines A–D (1–4) starting from L-tryptophan methyl ester and 2,3-O-isopropylidene-D-glyceraldehyde are described. The absolute configuration of the stereogenic center of (–)-dichotomine A (1) was reconfirmed as (S), on the basis of the X-ray crystallographic analysis of the conjugate (i.e., 17) of its methyl ester (i.e., 16) with (S)-N-tosylproline, whereas
描述了以 L-色氨酸甲酯和 2,3-O-异亚丙基-D-甘油醛为起始原料的 (-)-双亚甲基亚胺 A-D (1-4) 的新不对称全合成。(-)-二氯菌素 A (1) 的立体中心的绝对构型被重新确认为 (S),基于其甲酯 (即 16) 的共轭物 (即 17) 的 X 射线晶体学分析) 与 (S)-N-tosylproline,而 (-)-dichotomines B-D (2-4) 的立体中心的绝对构型被修改为 (R)。