Formation of enantiopure tricyclic compounds by intramolecular 1,3-dipolar cycloaddition of nitrones
作者:Hans Günter Aurich、Michael Geiger、Christian Gentes、Klaus Harms、Heiner Köster
DOI:10.1016/s0040-4020(98)00064-7
日期:1998.3
Nitrones 6 prepared from ester 5 underwent an intramolecular cycloaddition affording diastereomeric mixtures of tricyclic compounds 7A/B. These were separated to give the enantiopure compounds 7A and 7B. Starting from aminoalcohol 8 compounds 10A and 10B were formed via nitrones 9. Nitrone 9a yielded the trans-product 10aC in addition. X-ray analyses confirm the structure of 7aB and 10aA. Catalytic
由酯5制备的亚硝基6进行分子内环加成,得到三环化合物7A / B的非对映异构体混合物。将它们分离得到对映体纯化合物7A和7B。从氨基醇8开始,通过硝酮9形成化合物10A和10B。硝9A产生的反式-产物10AC除。X射线分析证实了7aB和10aA的结构。化合物7A和7B的催化加氢 产生双环γ-氨基醇,在将二乙基锌对苯甲醛的对映选择性加成中作为配体进行测试。