开发了一种通过MAD / n - Bu 4 NI介导的单活化MCP扩环制备官能化亚烷基吡咯烷的新颖合成途径。发现该反应的底物范围对于多种醛亚胺而言是宽泛的,并且对称地以及非对称地单活化的MCP以良好的产率(高达92%)产生相应的五元杂环化合物。该方法是对以前有关MCP环扩环的报告的补充,该报告显示,只需改变催化剂体系,就可以从同一MCP中实现不同杂环骨架的选择性合成。
开发了一种通过MAD / n - Bu 4 NI介导的单活化MCP扩环制备官能化亚烷基吡咯烷的新颖合成途径。发现该反应的底物范围对于多种醛亚胺而言是宽泛的,并且对称地以及非对称地单活化的MCP以良好的产率(高达92%)产生相应的五元杂环化合物。该方法是对以前有关MCP环扩环的报告的补充,该报告显示,只需改变催化剂体系,就可以从同一MCP中实现不同杂环骨架的选择性合成。
Enantioselective Catalytic Ring Expansion of Methylenecyclopropane Carboxamides Promoted by a Chiral Magnesium Lewis Acid
作者:Catherine Taillier、Mark Lautens
DOI:10.1021/ol0628614
日期:2007.2.1
A catalytic enantioselective ring expansion of monoactivated methylenecyclopropanes (MCP) in the presence of N-tosyl aldimines was developed using a chiral bis(oxazoline) ligand-MgI2 complex. After evaluation of ligands and optimization of the reaction conditions, the reaction has been applied to a variety of aromatic and heteroaromatic aldimines providing the corresponding trans-C2,C3-disubstituted
Use of a sterically demanding Lewis acid to direct ring expansion of monoactivated methylenecyclopropanes
作者:Catherine Taillier、Yann Bethuel、Mark Lautens
DOI:10.1016/j.tet.2007.05.081
日期:2007.8
A novel syntheticroute for the preparation of functionalized alkylidene pyrrolidines via a MAD/n-Bu4NI-mediated ringexpansion of monoactivated MCP was developed. The substrate scope for this reaction was found to be broad for a variety of aldimines and symmetrically as well as unsymmetrically monoactivated MCPs yielding the corresponding five-membered heterocyclic compounds in good yields (up to
开发了一种通过MAD / n - Bu 4 NI介导的单活化MCP扩环制备官能化亚烷基吡咯烷的新颖合成途径。发现该反应的底物范围对于多种醛亚胺而言是宽泛的,并且对称地以及非对称地单活化的MCP以良好的产率(高达92%)产生相应的五元杂环化合物。该方法是对以前有关MCP环扩环的报告的补充,该报告显示,只需改变催化剂体系,就可以从同一MCP中实现不同杂环骨架的选择性合成。