作者:Ruben P. van Summeren、Ben L. Feringa、Adriaan J. Minnaard
DOI:10.1039/b505980a
日期:——
towards the synthesis of the C1'-C16' side-chain of mycolactones A and B from Mycobacterium ulcerans are reported. Chiral building block 4 (Fig. 2) with the correct stereochemistry was obtained starting from naturally occurring monosaccharides, i.e. D-glucose or L-rhamnose. The polyunsaturated moiety 3 was synthesized in only 3 steps from 2,4-dimethylfuran. The building blocks were connected through a Sonogashira
据报道,从溃疡分枝杆菌中合成分枝杆菌内酯A和B的C1'-C16'侧链的新方法。从天然存在的单糖即D-葡萄糖或L-鼠李糖开始,获得具有正确立体化学的手性结构单元4(图2)。多不饱和部分3仅由3个步骤由2,4-二甲基呋喃合成。这些结构单元通过Sonogashira偶联剂连接,导致霉菌内酯A和B侧链的8,9-脱氢类似物2快速且收敛地组装。在此阶段,由于缺少α甲酰胺而阻碍了1的合成。嵌入共轭体系的炔烃的选择性部分氢化方案。涉及钯催化C7'和C8'或C9'和C10'之间的sp2-sp2偶联的替代策略(图。