Rhodium-catalyzed Asymmetric Ring-opening Reactions of<i>N</i>-Boc-azabenzonorbornadiene with<i>N</i>-Substituted Piperazine Nucleophiles
作者:Yuhua Wu、Dingqiao Yang、Heping Zeng、Lei Xie、Lihuan Wu、Haihong Mo、Xiongjun Zuo
DOI:10.1002/cjoc.201090059
日期:2010.2
Asymmetric ring‐opening reactions of N‐Boc‐azabenzonorbornadiene with N‐substituted piperazine nucleophiles in the presence of 5 mol% of [Rh(COD)Cl]2 and 10 mol% of chiral ligand, (R,S)‐PPF‐P‐t‐Bu2, gave the corresponding 1,2‐diamine product in moderate to excellent yields (up to 95%) with reasonable enantiomeric excesses (up to 70% ee). The results showed that the nature of ligands had significant
N -Boc-氮杂苯并降冰片二烯与N-取代的哌嗪亲核试剂在5 mol%[Rh(COD)Cl] 2和10 mol%手性配体(R,S)-PPF-P存在下的不对称开环反应-吨-Bu 2,给相应的1,2-二胺产物在中度至良好的产率(高达95%)以合理的对映体过量(多达70%ee值)。结果表明,配体的性质对产率和对映体过量有显着影响。