N-Heterocyclic Carbene Iron(III) Porphyrin-Catalyzed Intramolecular C(sp<sup>3</sup>
)-H Amination of Alkyl Azides
作者:Ka-Pan Shing、Yungen Liu、Bei Cao、Xiao-Yong Chang、Tingjie You、Chi-Ming Che
DOI:10.1002/anie.201806059
日期:2018.9.10
selective amination of tertiary, benzylic, allylic, secondary, and primary C−H bonds with up to 95 % yield. 14 out of 17 substrates were cyclized selectively at C4 to give pyrrolidines. The regioselectivity at C4 or C5 could be tuned by modifying the reactivity of the C5–H bond. Mechanistic studies revealed a concerted or a fast re‐bound mechanism for the amination reaction. The reaction has been applied
金属催化的叠氮化物分子内CH胺化反应是脂环族胺的一种吸引人的方法。扩大底物范围,增强区域选择性以及将该方法应用于天然产物合成方面仍然存在挑战。在本文中,我们报道了带有轴向N-杂环卡宾配体的铁(III)卟啉,其催化分子内C(sp 3)–在微波辅助和热条件下进行多种烷基叠氮化物的H胺化反应,从而选择性地胺化叔,苄基,烯丙基,仲和伯CH键,产率高达95%。将17种底物中的14种在C4选择性环化,得到吡咯烷。可以通过改变C5-H键的反应性来调节C4或C5的区域选择性。机理研究揭示了胺化反应的协调或快速重新结合机制。该反应已被用于合成托烷,尼古丁,顺式八氢吲哚和Leelamine衍生物。