Access to Optically Active 3-Aminopiperidines by Ring Expansion of Prolinols: Thermodynamic versus Kinetic Control
作者:Anne Cochi、Domingo Gomez Pardo、Janine Cossy
DOI:10.1002/ejoc.201101829
日期:2012.4
3-Aminopiperidines are of great interest because they can possess a wide range of biological activity depending on the nitrogen substituents. Different approaches their synthesis are presented and the most efficient is a ring expansion of prolinols induced by XtalFluor-E (diethylaminodifluorosulfinium tetrafluoroborate) in the presence of tetrabutylammonium azide, via an aziridinium intermediate, followed
3-氨基哌啶很受关注,因为它们可以根据氮取代基而具有广泛的生物活性。提出了不同的合成方法,最有效的是在四丁基叠氮化铵的存在下,通过氮丙啶中间体,由 XtalFluor-E(二乙基氨基二氟锍四氟硼酸盐)诱导的脯氨醇扩环,然后还原相应的叠氮化物。在动力学条件下,取决于脯氨醇上存在的取代基,可以获得 0:100 的 2-(叠氮甲基)吡咯烷/3-叠氮哌啶比率。