Synthesis of the C1-side chain of zaragozic acid D and progress towards a total synthesis
作者:Alan Armstrong、Paul A Barsanti、Toby J Blench、Ron Ogilvie
DOI:10.1016/s0040-4020(02)01514-4
日期:2003.1
A synthesis of a 1,3-dithiane corresponding to the C1-side chain of zaragozic acid D is described. An aldol reaction using an Evans oxazolidinone is the key step in controlling stereochemistry. Metallation of the derived dithiane monosulfoxide and coupling to an aldehyde effected construction of the C1–C7 bond. Subsequent steps are also reported, including acid-mediated ketalization resulting in formation
描述了对应于zaragozic酸D的C1侧链的1,3-二硫杂环丁烷的合成。使用伊文思恶唑烷酮的醛醇缩合反应是控制立体化学的关键步骤。衍生的二噻吩单亚砜的金属化和与醛的偶联影响了C1-C7键的结构。还报道了随后的步骤,包括酸介导的缩酮化作用,导致形成包含天然产物的双环缩酮核心的高级合成中间体。