Asymmetric organocatalytic α-amination of 2-oxindoles with bis(2,2,2-trichloroethyl)azo-dicarboxylate
作者:Mattia Bondanza、Gennaro Pescitelli、Alessandro Mandoli
DOI:10.1016/j.tetlet.2018.05.063
日期:2018.6
protected 3-hydrazino fragment into the corresponding primary amine was also demonstrated, to expand the synthetic flexibility of asymmetric electrophilic amination with azo-dicarboxylic esters en route to enantioenriched 3-amino-2-oxindoles. The absolute configuration of 3-amino-3-phenyl-2-oxindole was independently established by electronic circular dichroism (ECD), combined with time-dependent density
据报道,使用双(2,2,2-三氯乙基)偶氮二羧酸酯和可商购的金鸡纳生物碱有机催化剂,进行了3-取代的2-羟吲哚的对映选择性亲电胺化反应。在3-芳基底物的反应中获得了最佳结果,产率高至优异(定量为75%)和良好的立体选择性(ee为64-77%))。还证明了将被保护的3-肼基片段容易地还原转化为相应的伯胺,以扩大不对称亲电胺化与偶氮-二羧酸酯在向对映体富集的3-氨基-2-氧吲哚中的合成灵活性。通过电子圆二色性(ECD)结合时间依赖性密度泛函理论(TDDFT)独立确定了3-氨基-3-苯基-2-氧吲哚的绝对构型。