Entry into Lithium Ynolates from α,α,α-Tribromomethyl Ketones: Synthesis of Cyclobutenes via the [2 + 2] Cycloaddition with α,β-Unsaturated Carbonyls
作者:Yousuke Yamaoka、Hidetaka Imahori、Motoki Namioka、Ryo Nishina、Yukiko Kobori、Motoki Ueda、Mitsuru Shindo、Kiyosei Takasu
DOI:10.1021/acs.orglett.4c00202
日期:2024.3.8
reports the synthesis of cyclobutene derivatives in good yields via the [2 + 2] cycloaddition between lithium ynolates and α,β-unsaturated carbonyls. The ynolates are generated from α,α,α-tribromomethyl ketones and tert-butyl lithium via a simple and novel method, which does not produce any harmful byproducts, such as lithium alkoxide, which induces a polymerization reaction with α,β-unsaturated carbonyls
该研究报告了通过炔醇锂和 α,β-不饱和羰基之间的 [2 + 2] 环加成反应,以良好的产率合成了环丁烯衍生物。该炔醇化物由α,α,α-三溴甲基酮和叔丁基锂通过简单而新颖的方法生成,不会产生任何有害的副产物,例如醇锂,它会引发与α,β-不饱和羰基的聚合反应。