作者:David A. Evans、Jason J. Beiger、Jason D. Burch、Peter H. Fuller、Frank Glorius、Egmont Kattnig、David A. Thaisrivongs、William C. Trenkle、Joseph M. Young、Jing Zhang
DOI:10.1021/jacs.2c08244
日期:2022.11.2
reaction. Careful comparison of the spectroscopic data for the synthetic C3–C48 degradation fragment to that reported by the isolation group revealed a structural misassignment in the lactol region of the naturally derived degradation product. Ultimately, the data reported for the naturally derived aflastatin A C3–C48 degradation lactol (6a, R = H) were attributed to its derivative lactol trideuteriomethyl
已经完成了黄曲霉毒素A及其C3-C48降解片段(6a,R=H)的全合成。该合成具有几个复杂的非对映选择性片段偶联,包括 Felkin 选择性三苯甲基催化的 Mukaiyama 醛醇反应、螯合物控制的醛醇反应,涉及与镁的软烯醇化,以及抗 Felkin 选择性硼介导的氧化醛醇反应。将合成 C3-C48 降解片段的光谱数据与分离组报告的光谱数据进行仔细比较,揭示了天然衍生降解产物的乳醇区域的结构错误分配。最终,天然来源的黄曲霉毒素 A C3–C48 降解内酯的数据报告 ( 6a, R = H) 归因于它的衍生物 lactol trideuteriomethyl ether ( 6c , R = CD 3 )。此外,确认了六个立体异构中心(C8、C9 和 C28–C31)的修订绝对配置。