Cinchonidine-Catalyzed Synthesis of Oxazabicyclo[4.2.1]nonanones from <i>N</i>-Aryl-<i>α,β</i>-unsaturated Nitrones and 1-Ethynylnaphthalen-2-ols
作者:Cui Wei、Zhou Zhou、Guang-Li Pang、Cui Liang、Dong-Liang Mo
DOI:10.1021/acs.orglett.2c01049
日期:2022.6.17
1]nonanone derivatives were prepared in good yields through a cinchonidine-catalyzed cascade reaction of N-aryl-α,β-unsaturated nitrones and 1-ethynylnaphthalen-2-ols. Mechanistic studies show that the reaction undergoes a [4 + 3] cycloaddition of nitrones to vinylidene o-quinone methide generated in situ from 1-ethynylnaphthalen-2-ols in the presence of cinchonidine, 1,3-rearrangement of N–O vinyl moieties
通过辛可尼定催化的N-芳基-α,β-不饱和硝酮和1-乙炔基萘-2-醇的级联反应,以良好的收率制备了多种恶氮双环[4.2.1]壬酮衍生物。机理研究表明,在辛可尼定、N-O 乙烯基部分的 1,3-重排的情况下,该反应发生硝酮与 1-乙炔基萘-2-醇原位生成的亚乙烯基邻醌甲基化物的 [4 + 3] 环加成反应。 ,开环,最后是双分子内环化,在一锅反应中经过五步得到恶氮双环[4.2.1]壬酮。