Rare-Earth-Catalyzed Selective 1,4-Hydrosilylation of Branched 1,3-Enynes Giving Tetrasubstituted Silylallenes
作者:Wufeng Chen、Chunhui Jiang、Jianying Zhang、Jiaqi Xu、Lin Xu、Xiufang Xu、Jianfeng Li、Chunming Cui
DOI:10.1021/jacs.1c04689
日期:2021.8.25
reactivities. Catalytic 1,4-hydrosilylation of 1,3-enynes may present the straightforward strategy for synthesis of silylallenes. However, the transition-metal-catalyzed reaction has not been successful due to poor selectivity and very limited substrate scopes. We report here the efficient and selective 1,4-hydrosilylation of branched 1,3-enynes enabled by the ene-diamido rare-earth ate catalysts using both alkyl
艾伦烯是有机合成和药物化学中的多功能合成子,因为它们具有多种反应性。1,3-烯炔的催化 1,4-氢化硅烷化可能是合成甲硅烷基丙二烯的直接策略。然而,由于选择性差和底物范围非常有限,过渡金属催化的反应并未成功。我们在此报告了支链 1,3-烯炔的高效和选择性 1,4-氢化硅烷化,由烯-二氨基稀土催化剂使用烷基和芳基氢硅烷实现,导致独家形成四取代的甲硅烷基丙二烯。进行了氘化反应、动力学研究和 DFT 计算以研究可能的机制,揭示了高路易斯酸度、大离子半径和稀土催化剂的结构的关键作用。