Chiral Amino Alcohol Accelerated and Stereocontrolled Allylboration of Iminoisatins: Highly Efficient Construction of Adjacent Quaternary Stereogenic Centers
作者:Qiuyuan Tan、Xinqiao Wang、Yang Xiong、Zimeng Zhao、Lu Li、Pei Tang、Min Zhang
DOI:10.1002/anie.201700581
日期:2017.4.18
We have developed a highly efficient asymmetric allylboration of ketimines with nonchiral γ,γ‐disubstituted allylboronic acids by using a chiral amino alcohol as the directing group, which is otherwise challenging. The amino alcohol not only serves as a cheap source of nitrogen and chirality, but also dramatically enhances the reactivity. The versatility of this method was demonstrated by its ability
我们已经通过使用手性氨基醇作为导向基团开发了一种高效的酮亚胺与非手性γ,γ-二取代的烯丙基硼酸的不对称烯丙基硼酸酯,这在其他方面具有挑战性。氨基醇不仅可以作为氮和手性的廉价来源,而且还可以显着提高反应性。该方法具有多种功能,可通过邻近的季碳中心访问所有四个立体异构体,从而证明了该方法的多功能性。提出了反应模型来解释非对映选择性和速率加速作用。