Copper-promoted site-selective carbonylation of sp<sup>3</sup> and sp<sup>2</sup> C–H bonds with nitromethane
作者:Xuesong Wu、Jinmin Miao、Yanrong Li、Guigen Li、Haibo Ge
DOI:10.1039/c6sc01087c
日期:——
Copper-promoted direct carbonylation of unactivated sp3 C–H and aromatic sp2 C–H bonds of amides was developed using nitromethane as a novel carbonyl source. The sp3 C–H functionalization showed high site-selectivity by favoring the C–H bonds of α-methyl groups. The sp2 C–Hcarbonylation featured high regioselectivity and good functional group compatibility. Kinetic isotope effect studies indicated
The first copper‐catalyzed intramolecular C(sp3)H and C(sp2)H oxidative amidation has been developed. Using a Cu(OAc)2 catalyst and an Ag2CO3 oxidant in dichloroethane solvent, C(sp3)H amidation proceeded at a terminal methyl group, as well as at the internal benzylic position of an alkyl chain. This reaction has a broad substrate scope, and various β‐lactams were obtained in excellent yield, even
第一铜催化的分子内C(SP 3) H和(SPç 2) ħ氧化酰胺化得到了发展。在二氯乙烷溶剂中使用Cu(OAc)2催化剂和Ag 2 CO 3氧化剂,在末端甲基以及烷基链的内部苄基位置处进行C(SP 3)H酰胺化反应。该反应具有广泛的底物范围,即使以克为单位,也能以优异的收率获得各种β-内酰胺。在O 2下使用CuCl 2和Ag 2 CO 3但是,在二甲基亚砜中的空气会通过C(SP 2)H酰胺化选择性地生成2-吲哚酮。动力学同位素效应(KIE)的研究表明,Ç H键活化是速率决定步骤。可以通过氧化除去5-甲氧基喹啉基。
C–N and C–O Bond Formation in Copper-Catalyzed/Mediated sp<sup>3</sup> C–H Activation: Mechanistic Studies from Experimental and Computational Aspects
作者:Yuhang Yang、Fei Cao、Linbin Yao、Tao Shi、Bencan Tang、Yoichiro Kuninobu、Zhen Wang
DOI:10.1021/acs.joc.0c01038
日期:2020.8.7
studies on Cu-catalyzed/mediated sp3 C–Hamidation and acetoxylation are investigated from experimental and computational aspects. The concerted metalation–deprotonation (CMD) mechanism rather than a radical-involved pathway is proved to occur in amidation and acetoxylation reactions, and this is the rare example of the CMD mechanism involved in the more challenging sp3 C–H activations. Theoretical calculations
(−CH2CF3) group into the organic compounds by activating the distal C(sp3)–H bond is a challenging but crucial task in organic chemistry. This transformation imparts unique physicochemical properties to the compounds, such as enhanced lipophilicity, metabolic stability, and altered electronic characteristics. In this study, we unveil a new palladium-catalyzed method to directly introduce the trifluoroethyl