exo-Selective asymmetric 1,3-dipolar cycloaddition of azomethine ylides with alkylidene malonates catalyzed by AgOAc/TF-BiphamPhos
作者:Zhi-Yong Xue、Tang-Lin Liu、Zhou Lu、He Huang、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1039/b919625k
日期:——
The first exo-selective asymmetric 1,3-dipolar cycloaddition of alkylidene malonates with azomethine ylides catalyzed by AgOAc/TF-BiphamPhos has been reported in good yields and good to excellent enantio-/diastereoselectivities.
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)
AgOAc/ThioClickFerrophos complex-catalyzed 1,3-dipolar cycloaddition of glycine imino ester, the precursor of azomethine ylide, with aryl- and alkylidene malonates afforded the corresponding exo-cycloadducts, that is, proline ester derivatives in high yields with high enantiomeric excess (up to 99% ee). The reactions proceeded smoothly under base-free conditions demonstrating the bifunctional catalysis of the silver complex. (C) 2014 Elsevier Ltd. All rights reserved.
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).