Rapid synthesis of substituted pyrrolines and pyrrolidines by nucleophilic ring closure at activated oximes
作者:Nandkishor Chandan、Amber L. Thompson、Mark G. Moloney
DOI:10.1039/c2ob26423d
日期:——
Substituted pyrrolines are available by ring closure initiated by direct nucleophilic attack of stabilized enolates at the nitrogen of oximes activated with a leaving group, in a process which effectively out-competes the more usual Beckmann rearrangement. Subsequent reduction provides diastereoselective access to the corresponding pyrrolidines. This provides a rapid route to saturated heterocyclic
取代的吡咯啉可通过闭环反应来获得,该闭环反应是由稳定的烯醇酸酯在离去基团激活的肟的氮原子上进行亲核攻击而发起的,该过程可有效地胜过更常见的贝克曼重排。随后的还原提供非对映选择性地进入相应的吡咯烷。这提供了从容易获得的前体到饱和杂环系统的快速途径。