A flexible enantioselective approach to 3,4-dihydroxyprolinol derivatives by SmI2-mediated reductive coupling of chiral nitrone with ketones/aldehydes
作者:Hong-Kui Zhang、Shou-Qiang Xu、Jia-Jia Zhuang、Jian-Liang Ye、Pei-Qiang Huang
DOI:10.1016/j.tet.2012.06.006
日期:2012.8
derivatives was described, which is based on the samarium diiodide-mediated reductive coupling of the chiral nitrone (3S,4R)-8, derived from d-isoascorbic acid with aldehydes/ketones. Thereby, polyhydroxyprolinol derivatives 9a–e and 9h–j were obtained from aromatic ketones and aliphatic aldehydes in good to excellent yields of 65–91%. These reductive hydroxyalkylations are highly diastereoselective
描述了一种灵活的对映多羟基化脯氨醇衍生物的对映选择性方法,该方法基于io二碘化物介导的衍生自d-异抗坏血酸与醛/酮的手性硝酮(3 S,4 R)-8的还原偶联。因此,从芳族酮和脂族醛中获得多羟基脯氨醇衍生物9a – e和9h – j的产率高达65–91%。这些还原性羟烷基化在建立C-4立体异构中心时具有很高的非对映选择性。通过这种方式,(-)-8a- epi- swainsonine(4)和(-)-8,8a-di- Epi - swainsonine(5)已实现。