A Cu<sup>II</sup>-N,P Oxazolinylferrocene Ligand Complex for the Asymmetric [3+2] 1,3-Dipolar Cycloaddition of Azomethine Ylide with Malonates
作者:Li Dai、Di Xu、Li-Wei Tang、Zhi-Ming Zhou
DOI:10.1002/cctc.201403048
日期:2015.4.7
A series of enantioselective pyrrolidine‐2,4,4‐tricarboxylate derivatives were synthesized by the [3+2] 1,3‐dipolar cycloaddition of azomethineylide with alkylidene malonates. By using 4 mol % of a CuIIN,Poxazolinylferroceneligandcomplex and 10 mol % of a base, pyrrolidine analogues were obtained in high yields (77–99 %) and excellent enantioselectivities (up to 99 % ee).