Conjugate addition-enantioselective protonation to forge tertiary stereocentres α to azaarenes via cooperative hydrogen atom transfer and chiral hydrogen-bonding catalysis
作者:Yaqi Tan、Yanli Yin、Shanshan Cao、Xiaowei Zhao、Guirong Qu、Zhiyong Jiang
DOI:10.1016/s1872-2067(21)63887-1
日期:2022.3
Cooperative hydrogen atom transfer and chiral hydrogen-bonding catalysis as a new platform for the asymmetric synthesis of azaarene derivatives is reported. By using a tetrabutylammonium decatungstate as the photocatalyst and a chiral phosphoric acid as the hydrogen-bonding catalyst, transformations of a variety of commercially available hydrocarbons and silanes with diverse α-branched 2-vinylazaarenes
报道了协同氢原子转移和手性氢键催化作为不对称合成氮杂芳烃衍生物的新平台。通过使用四丁基十钨酸铵作为光催化剂和手性磷酸作为氢键催化剂,各种商业上可用的烃和硅烷与不同的 α-支化 2-乙烯基氮杂芳烃的转化可以有效地经历串联自由基共轭加成和对映选择性质子化过程,提供了一种方便且完全原子经济的方法,以高产率获得一系列有价值的对映体富集的 α-叔氮杂芳烃,对映体选择性良好(高达 93% ee)。通过直接使用叔-丁基甲基氨基甲酸酯作为原料,该方法能够高度实用和简洁地合成对映体纯的药物分子苯那敏(Avil)。