Ir-Catalyzed Allylic Amination/Ring-Closing Metathesis: A New Route to Enantioselective Synthesis of Cyclic β-Amino Alcohol Derivatives
作者:Jun Hee Lee、Seunghoon Shin、Jahyo Kang、Sang-gi Lee
DOI:10.1021/jo070998h
日期:2007.9.1
Ir-catalyzed allylic aminations of (E)-4-benzyloxy-2-butenyl methyl carbonate with benzylamine using Feringa's (Sa,Sc,Sc)-phosphoramidite as a chiral ligand afforded linear-aminated achiral product N,O-dibenzyl-4-amino-2-buten-1-ol regioselectively (linear/branched = >99/1), whereas the (E)-5-benzyloxy-2-pentenyl methyl carbonate showed completely opposite regioselectivity (linear/branched = >1/99)
以Feringa(S a ,S c ,S c)-亚磷酰胺为手性配体,将(E)-4-苄氧基-2-丁烯基碳酸酯与苄胺进行Ir催化的烯丙基胺化反应,得到线性胺化的非手性产物N,O-二苄基-4-氨基-2-丁烯-1-醇区域选择性(线性/分支=> 99/1),而(E)-5-苄氧基-2-戊烯基碳酸甲酯显示完全相反的区域选择性(线性/分支=> 1 / 99)并提供旋光性(3 R)-N,O-二苄基化的3-氨基-1-戊烯-5-醇,具有很高的对映选择性(96%ee),用作通过闭环易位高效合成各种环状β-氨基醇衍生物的关键中间体。