An exo- and Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides with Alkylidene Malonates Catalyzed by a N,O-Ligand/Cu(OAc)2-Derived Chiral Complex
作者:Ming Wang、Zheng Wang、Yu-Hua Shi、Xiao-Xin Shi、John S. Fossey、Wei-Ping Deng
DOI:10.1002/anie.201007960
日期:2011.5.16
An exo‐lent catalyst: An N,O‐ligand/Cu(OAc)2 derived chiral complex is an excellent catalyst for inducing asymmetry in the catalytic enantioselective 1,3‐dipolar cycloadditions of azomethineylides with various alkylidene malonates. A series of highly functionalized exo‐pyrrolidines were obtained in excellent yields (80–99 %) and enantioselectivities (91–99 % ee; see scheme; M.S.: molecular sieve)
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).