作者:Jennifer Ciesielski、Geoffroy Dequirez、Pascal Retailleau、Vincent Gandon、Philippe Dauban
DOI:10.1002/chem.201600393
日期:2016.6.27
nucleophilic ring opening induced by an Rh‐bound nitrene generated in situ, details of which were uncovered by both experimental and theoretical studies. In particular, DFT calculations show that the nitrogen atom of the putative [Rh]2=NR metallanitrene intermediate is electrophilic and support an aziridine activation pathway by N⋅⋅⋅N=[Rh]2 bond formation, in addition to the N⋅⋅⋅[Rh]2=NR coordination mode.
Rh II催化的烯烃氧化和氨基化反应分别生成1,2-氨基醇和1,2-二胺,收率高至优异,并且具有完全的区域控制能力。在金属化的情况下,分子内反应提供了制备吡咯烷的有效方法,并且分子间反应产生具有正交保护基的邻位胺。这些烯烃的双官能化是通过叠氮化进行的,然后由原位生成的Rh结合的腈诱导亲核开环,实验和理论研究均未揭示其细节。尤其是,DFT计算表明,推定的[Rh] 2 = NR金属镧系中间体的氮原子是亲电子的,并通过N支持氮丙啶激活途径除了N⋅⋅⋅ [Rh] 2 = NR配位模式之外,⋅⋅⋅N = [Rh] 2键的形成。