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 azomethine ylide with alkylidene malonates. By using 4 mol % of a CuIIN,P oxazolinylferrocene ligand complex and 10 mol % of a base, pyrrolidine analogues were obtained in high yields (77–99 %) and excellent enantioselectivities (up to 99 % ee).
通过对亚甲亚胺叶立德与亚烷基丙二酸酯的[3 + 2] 1,3-偶极环加成反应,合成了一系列对映选择性吡咯烷-2,4,4-三羧酸酯衍生物。通过使用4 mol%的Cu IIN,P恶唑啉基二茂铁配体配合物和10 mol%的碱,可以高产率(77–99%)和优异的对映选择性(高达99%ee)获得吡咯烷类似物。