Rhodium-Catalyzed Asymmetric Addition of Organoboronic Acids to Aldimines Using Chiral Spiro Monophosphite-Olefin Ligands: Method Development and Mechanistic Studies
作者:Huanyu Shan、Qiaoxia Zhou、Jinglu Yu、Shuoqing Zhang、Xin Hong、Xufeng Lin
DOI:10.1021/acs.joc.8b01764
日期:2018.10.5
on a hexamethyl-1,1′-spirobiindane scaffold was accomplished starting from Bisphenol C. The optimal ligand could serve as an elegant chiral bidentate ligand in the Rh-catalyzed asymmetric 1,2-addition of organoboronic acids to various acyclic/cyclic aldimines, leading to chiral amines with high yields and excellent enantioselectivities. Detailed stereochemical models for enantioselective induction
Synthesis of Chiral Tertiary Amine–Thioureas Based on Spirobiindane and Application in Catalytic Asymmetric Michael Addition Reaction
作者:Zhao Han、Xufeng Lin
DOI:10.1055/s-0039-1691643
日期:2020.4
A series of novel chiral bifunctional tertiary amine–thioureas based on spirobiindane were designed and synthesized as organocatalysts. One of these catalysts was shown to promote the asymmetric Michael addition reaction of 1,3-diphenylpropane-1,3-dione to nitroolefins, affording the desired products in good yields (up to 95%) and enantioselectivities (up to 98% ee).
Iron-Catalyzed Enantioselective Si–H Bond Insertions
作者:Haorui Gu、Zhao Han、Hujun Xie、Xufeng Lin
DOI:10.1021/acs.orglett.8b02868
日期:2018.10.19
enantioselective Si–H bond insertion reaction of α-diazoesters was developed. A new chiral spiro-bisoxazoline ligand has proven to be an optimal ligand for the asymmetric reaction to give versatile chiral α-silylesters in good yields with high enantioselectivities. The mechanism and detailed stereochemical models for enantioselective induction were elucidated by DFT calculations, suggesting that the