Rhodium-Catalyzed Stereospecific C−H Amination for the Construction of Spiroaminal Cores: Reactivity Difference between Nitrenoid and Carbenoid Species against Amide Functionality
作者:Masato Kono、Shingo Harada、Tetsuhiro Nemoto
DOI:10.1002/chem.201701464
日期:2017.6.1
metal carbenoids exhibit similar reactivity for insertion into a C−H bond and a C=C double bond. These reactions have attracted the attention of organic chemists due to their unusual bond‐forming ability, but the reactivity difference between these chemical species has not been studied. In this paper, we examined the reactivity difference using the corresponding Rh nitrenoid and Rh carbenoid precursors
金属类固醇和金属类固醇类化合物对于插入CH键和C = C双键具有相似的反应性。这些反应由于其不寻常的键形成能力而吸引了有机化学家的注意,但是尚未研究这些化学物质之间的反应性差异。在本文中,我们检查了使用相应的Rh en烯和Rh类胡萝卜素前体的反应性差异。Rh类氮烯插入分子内C(sp 3)-H键与酰胺氮相邻,提供天然产物中普遍存在的功能化螺氨基化合物,而Rh类胡萝卜素插入到酰胺C-N键中。完全不同的反应性是通过相对较低的Rh亚硝胺的CH插入反应的能垒来实现的。计算分析表明,差异的根源是配位原子与Rh络合物的亲电子性。