Enantiodivergent Brucine Diol-Catalyzed 1,3-Dipolar Cycloaddition of Azomethine Ylides with α,β-Unsaturated Ketones
作者:Jian-Yuan Li、Hun Young Kim、Kyungsoo Oh
DOI:10.1002/adsc.201500958
日期:2016.3.17
Enantiodivergent catalyst systems were developed using metals with different ionic radii and a multifunctional brucine diol (BD) ligand. The catalytic use of purported 1:1 Cu‐BD complexes in the 1,3‐dipolar cycloaddition of azomethine ylides with chalcones resulted in the selective formation of endo‐pyrrolidines in 87–96% ees with an absolute stereochemical outcome of (2R,3S,4R,5S). In contrast, an
使用具有不同离子半径和多功能杜鹃花二醇(BD)配体的金属开发了对映异构体催化剂体系。所谓的1:1 Cu-BD配合物在1,3-偶极环加成亚甲基亚胺与查耳酮的催化中的使用导致在87-96%ee中选择性形成内吡咯烷核苷,绝对立体化学结果为(2 R,3 S, 4 R, 5 S)。相反,使用衍生自Ag(I)盐和BD的催化剂观察到相反的绝对立体化学结果。对广泛种类的底物/反应类型的对映发散方法的证明强调了它们在不对称合成中的合成价值。