Step-Economical Synthesis of the Marine Ascidian Antibiotics Cadiolide A, B, and D
作者:John Boukouvalas、Charles Thibault
DOI:10.1021/jo502503w
日期:2015.1.2
include (i) one-pot assembly of a key β-aryl-α-benzoylbutenolide building block by regiocontrolled “click–unclick” oxazole–ynone Diels–Alder cycloaddition/cycloreversion and ensuing 2-alkoxyfuran hydrolysis and (ii) a protecting group-free vinylogous Knoevenagel condensation enabling rapid access to cadiolides A, B, and D from a common precursor.
报告了标题天然产物的简洁,模块化和高效的合成方法。显着的步骤包括(i)通过区域控制的“点击-取消”恶唑-炔酮Diels-Alder环加成/环还原反应,一锅组装关键的β-芳基-α-苯甲酰基丁烯内酯结构单元,并随后进行2-烷氧基呋喃水解;以及(ii)保护不含基团的乙烯基Knoevenagel缩合反应,可从常见的前体中快速获得联苯醚A,B和D。