作者:William R. Roush、Thomas G. Marron、Lance A. Pfeifer
DOI:10.1021/jo961841k
日期:1997.2.1
A highly diastereoselective synthesis of methyl pederate (2) is described. A critical feature of the successful route is the introduction of the key C(7)-stereocenter at the stage of 4 via an enantioselective, syn-selective aldol reaction of aldehyde 5 and the chiral acyl oxazolidinone 6. Aldehyde 5, in turn, was prepared from the readily available aldol derivative 7 via a chelate-controlled reaction
描述了一种高非对映体选择性合成人鞭毛酸甲酯(2)。成功路线的关键特征是在4阶段通过醛5和手性酰基恶唑烷二酮6的对映选择性,顺选择性醛醇缩合反应引入关键的C(7)-立体中心。醛5反过来是通过与烯丙基三甲基硅烷的螯合物控制的反应,由容易得到的羟醛衍生物7制备。中间体4通过7-O-(3,4-二甲氧基苄基)硬脂酸(3)(通过Kishi's合成Mycalamides A和B和Onnamide A的中间体)通过甲基吡喃糖苷10和受保护的鸟酸衍生物11。