在这项研究中,我们记录了海洋蓝细菌次级代谢产物27-deoxylyngbyabellin A的第一个全合成,该合成以10个线性步骤进行,总收率为9.7%。关键步骤包括(1)(S)-2-(苄氧基)-3-甲基丁酸和Boc-1-Ile-OH与β-叠氮基二硫键的一锅级联反应,以访问两个关键的噻唑单元, (2)手性草氮杂硼硼烷酮介导的不对称醛醇缩合反应以构建(S)-β-羟基酯,以及(3)二苯叠氮磷酸酯介导组装的线性前体的大内酰胺化,从而获得天然产物27-脱氧lyngbyabellin A.
The first total synthesis of lyngbyabellin A, a novel peptolide from the marine cyanobacterium Lyngbyamajuscula, is described. Both functionalized thiazole carboxylic acid units were synthesized using our CMD (chemical manganese dioxide) oxidation from the corresponding thiazolidines. The asymmetric synthesis of the dichlorinated β-hydroxy acid was achieved by the chiral oxazaborolidinone mediated