[Rh<sup>III</sup>(Cp*)]-Catalyzed<i>ortho</i>-Selective Direct C(sp<sup>2</sup>)H Bond Amidation/Amination of Benzoic Acids by<i>N</i>-Chlorocarbamates and<i>N</i>-Chloromorpholines. A Versatile Synthesis of Functionalized Anthranilic Acids
作者:Fo-Ning Ng、Zhongyuan Zhou、Wing-Yiu Yu
DOI:10.1002/chem.201304855
日期:2014.4.7
furnishing highly functionalized anthranilic acids. A stoichiometric reaction of a cyclometallated rhodium(III) complex of benzo[h]quinoline with a silver salt of N‐chlorocarbamate afforded an amido–rhodium(III) complex, which was isolated and structurally characterized by X‐ray crystallography. This finding confirmed that the CN bond formation results from the cross‐coupling of N‐chlorocarbamate with
负载Rh III催化的直接邻-C ħ酰胺化/的苯甲酸胺化Ñ -chlorocarbamates / Ñ -chloromorpholines达到,使在高达85%的产率具有优异的邻氨基苯甲酸邻-选择性和官能基的耐受性。带有各种酰胺基的氨基甲酸酯(包括NHCO 2 Me,NHCbz和NHTroc(Cbz =碳苄氧基; Troc =三氯乙基氯甲酸酯))以及仲胺(例如吗啉,哌嗪和哌啶)可成功实现苯甲胺胺化,并提供高度官能化的邻氨基苯甲酸酯酸。苯并[ h]的环金属化铑(III)配合物的化学计量反应]喹啉与N-氯氨基甲酸酯的银盐可提供酰胺基铑(III)络合物,该络合物已分离并通过X射线晶体学对其结构进行了表征。这一发现证实了CN键的形成是由于N-氯氨基甲酸酯与芳基-铑(III)配合物的交叉偶联。然而,关于CN键形成的机理细节仍不清楚。涉及1,2-芳基迁移和铑(V)-氮烯的途径是合理的。