A concise and straightforward total synthesis of (±)-salinosporamide A, based on a biosynthesis model
作者:Nicholas P Mulholland、Gerald Pattenden、Iain A. S. Walters
DOI:10.1039/b803818j
日期:——
A 14-step total synthesis of (+/-)-salinosporamide A (1), a potent inhibitor of the 20S proteasome isolated from the marine bacterium Salinospora tropica, is described. The synthesis is based on a diastereoselective intramolecular aldolisation of a substituted beta-keto amide intermediate, i.e. 13, derived from a beta-keto acid, viz. 21, and an alpha-amino malonate, leading to the pyrrolidinone ring
描述了一个14步的总合成(+/-)-salinosporamide A(1),这是一种从海洋细菌Salinospora tropica分离出的20S蛋白酶体的有效抑制剂。所述合成基于衍生自β-酮酸的取代的β-酮酰胺中间体,即13的非对映选择性分子内醛醇缩合。21和一个α-氨基丙二酸酯,导致天然产物中的吡咯烷酮环24。这种合成方法在体内模拟了唾液孢子酰胺A中吡咯烷酮环的起源。总合成的另一个关键特征是使用超氢化物将丙二酸酯衍生物31区域选择性还原为关键的醛中间体32。