作者:Xiaojian Jiang、Shenghui Liu、Si Yang、Mei Jing、Lipeng Xu、Pei Yu、Yuqiang Wang、Ying-Yeung Yeung
DOI:10.1021/acs.orglett.8b01125
日期:2018.6.1
A novel enantioselective bromolactonization of α,β-unsaturated ketones using bifunctional amino-urea catalysts has been developed. The scope of the reaction is evidenced by 23 examples of halolactones bearing various functionalities with up to 99% yield and 99:1 er. Unlike typical urea catalysts that require electron-deficient substituents to enhance the hydrogen bond strength, it is interesting to
已经开发出使用双官能氨基脲催化剂的α,β-不饱和酮的新型对映选择性溴化。该反应的范围由具有各种官能度的卤代内酯的23个实例证明,产率高达99%,er为99:1 er。与需要缺乏电子的取代基来增强氢键强度的典型尿素催化剂不同,有趣的是,在这种情况下,富含电子的脲对于高对映选择性是必不可少的。此外,实验数据表明,卤代内酯化合物对LPS诱导的RAW 264.7细胞具有相当大的抗炎作用。