Iridium-Catalyzed Intermolecular Amidation of sp3 C–H Bonds: Late-Stage Functionalization of an Unactivated Methyl Group
摘要:
Reported herein is the iridium-catalyzed direct amidation of unactivated sp(3) C-H bonds. With sulfonyl and acyl azides as the amino source, the amidation occurs efficiently under mild conditions over a wide range of unactivated methyl groups with high functional group tolerance. This procedure can be successfully applied for the direct introduction of an amino group into complex compounds and thus can serve as a powerful synthetic tool for late-stage C-H functionalization.
Iridium(III)-Catalyzed Direct Arylation of C–H Bonds with Diaryliodonium Salts
作者:Pan Gao、Wei Guo、Jingjing Xue、Yue Zhao、Yu Yuan、Yuanzhi Xia、Zhuangzhi Shi
DOI:10.1021/jacs.5b06758
日期:2015.9.30
arylation of complex compounds. Mechanistic studies by density functional theory calculations suggested that the sp(3) C-H activation was realized by a triflate-involved concerted metalation-deprotonation process, and the following oxidation of Ir(III) to Ir(V) is the most favorable when a bistriflimide is contained in the diaryliodonium salt. Calculations indicated that both steps are enabled by initial anion
Rhodium(III)‐Catalyzed Amidation of Unactivated C(sp
<sup>3</sup>
)H Bonds
作者:He Wang、Guodong Tang、Xingwei Li
DOI:10.1002/anie.201506323
日期:2015.10.26
Nitrogenation by direct functionalization of CHbonds represents an important strategy for constructing CN bonds. Rhodium(III)‐catalyzed direct amidation of unactivatedC(sp3)Hbonds is rare, especially under mild reaction conditions. Herein, a broad scope of C(sp3)Hbonds are amidated under rhodium catalysis in high efficiency using 3‐substituted 1,4,2‐dioxazol‐5‐ones as the amide source. The
Palladium-Catalyzed Oxygenation of Unactivated sp<sup>3</sup> C−H Bonds
作者:Lopa V. Desai、Kami L. Hull、Melanie S. Sanford
DOI:10.1021/ja046831c
日期:2004.8.1
This communication describes a new palladium-catalyzed method for the oxygenation of unactivated sp3 C-H bonds. A wide variety of alkane substrates containing readily available oxime and/or pyridine directing groups are oxidized with extremely high levels of chemo-, regio-, and in some cases diastereoselectivity. The substrate scope of these reactions is discussed, and the high selectivities are rationalized on the basis of the requirements of putative palladium alkyl intermediates.