作者:Richard P Hsung、Kevin P Cole、Luke R Zehnder、Jiashi Wang、Lin-Li Wei、Xiao-Fang Yang、Heather A Coverdale
DOI:10.1016/s0040-4020(02)01524-7
日期:2003.1
A 20-step total synthesis of (±)-arisugacin A with an overall yield of 2.1% is described here in detail. This synthesis features a formal [3+3] cycloaddition reaction of α,β-unsaturated iminium salts with 6-aryl-4-hydroxy-2-pyrones through a highly stereoselective 6π-electron electrocyclic ring-closure of 1-oxatriene. A strategic dihydroxylation–deoxygenation protocol leading to the desired angular
本文详细描述了20步合成(±)-芦荟素A,总产率为2.1%。该合成的特征在于,α,β-不饱和亚胺盐与6-芳基-4-羟基-2-吡喃酮通过1-氧杂三烯的高度立体选择性6π-电子电环闭环的形式[3 + 3]环加成反应。开发了一种战略性的二羟基化-脱氧方案,以实现所需的角C12a-OH,这是导致最终完成阿瑞新霉素A合成的关键步骤。这种合成努力还导致了一个有趣且出乎意料的逆向羟醛-羟醛序列。 AB环。