Catalyst‐Free Electrophilic Ring Expansion of
<i>N</i>
‐Unprotected Aziridines with
<i>α</i>
‐Oxoketenes to Efficient Access 2‐Alkylidene‐1,3‐Oxazolidines
作者:Xingpeng Chen、Zhengshuo Huang、Jiaxi Xu
DOI:10.1002/adsc.202100320
日期:2021.6.21
2-(2-Oxoalkylidene)-1,3-oxazolidine derivatives were synthesized in good to excellent yields regiospecifically through the catalyst-free electrophilic ring expansion of N-unprotected aziridines and the ketene C=O double bond of α-oxoketenes, in situ generated from the microwave-assisted Wolff rearrangement of 2-diazo-1,3-diketones. The ring expansion predominantly underwent an SN1 process and the hydrogen
2-(2-氧代亚烷基)-1,3-恶唑烷衍生物通过无催化剂的N-未保护氮丙啶和α-氧代烯酮的烯酮C=O双键的无催化剂亲电子环膨胀,以良好到优异的产率区域特异性地合成,原位由 2-重氮-1,3-二酮的微波辅助沃尔夫重排产生。环膨胀主要经历了 S N 1 过程,氢键决定了产物的 ( E )-构型。