Stereoselective Synthesis of the Glycosidase Inhibitor Australine through a One-Pot, Double-Cyclization Strategy
作者:Celia Ribes、Eva Falomir、Miguel Carda、J. Alberto Marco
DOI:10.1021/ol062570v
日期:2007.1.1
[reaction: see text] A stereocontrolled, convergent synthesis of the alkaloid australine, a glycosidase inhibitor of the pyrrolizidine class, is described. The chiral starting materials were ketone 3, derived from L-erythrulose, and alpha-alkoxy aldehyde 4, prepared from L-malic acid. A key step of the synthesis was the highly stereoselective aldol reaction between 4 and a Z boron enolate derived from
[反应:见正文]描述了立体生物控制的,聚合的生物碱类奥特林的合成,吡咯烷嗪类的糖苷酶抑制剂。手性起始原料是衍生自L-赤藓糖的酮3和衍生自L-苹果酸的α-烷氧基醛4。合成的关键步骤是4与3衍生的Z硼烯醇盐之间的高立体选择性醛醇缩合反应。另一关键步骤是通过三步序列由SN2引起的SN2置换的一锅法构建双环吡咯嗪系统。偏苯三酸酯前体上的苄胺。