Iron-catalyzed alkylation of α-oxo ketene dithioacetals
作者:Qin Yang、Ping Wu、Jiping Chen、Zhengkun Yu
DOI:10.1039/c4cc02264e
日期:——
Iron-catalyzed alkylation of α-oxo ketene dithioacetals by styrenes efficiently afforded highly functionalized tetrasubstituted olefins.
铁催化的α-氧酮二硫代醛与苯乙烯的烷基化反应高效地合成了高度官能化的四取代烯烃。
Ruthenium- and Rhodium-Catalyzed Chemodivergent Couplings of Ketene Dithioacetals and α-Diazo Ketones via C–H Activation/Functionalization
作者:Manman Wang、Lingheng Kong、Qiyue Wu、Xingwei Li
DOI:10.1021/acs.orglett.8b01890
日期:2018.8.3
Chemodivergent coupling of α-acylketene dithioacetals with diazo compounds has been realized under catalyst control. The Ru(II)-catalyzed C–H activation occurred at the olefinic position, and 1:2 coupling with α-diazoketoesters leads to furfurylation. In contrast, the Rh(III)-catalyzed C–H functionalization occurred at both the olefinic and the ortho C(aryl)–H positions, and [4 + 2] annulation afforded
This work describes an electrochemicalammoniumcation enabled hydropyridylation of ketone-activated alkenes under metal- and exogenous reductant free conditions giving access to β-pyridyl ketones, through dual proton-coupled electron transfer and radical cross-coupling. It features a broad substrate scope and allows a gram-scale synthesis. Ammonium chloride plays various roles in this transformation
2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)-Mediated C(<i>sp</i>
<sup>2</sup>
)-C(<i>sp</i>
<sup>3</sup>
) Cross-Dehydrogenative Coupling Reaction: α-Alkylation of Push-Pull Enamines and α-Oxo Ketene Dithioacetals
作者:Dongping Cheng、Lijun Wu、Zhiteng Deng、Xiaoliang Xu、Jizhong Yan
DOI:10.1002/adsc.201700853
日期:2017.12.19
A novel, metal‐free cross‐dehydrogenativecoupling (CDC) reaction of C(sp2)–H bonds of enamines and α‐oxo ketene dithioacetals with C(sp3)–H bonds of 1,3‐diarylpropenes mediated by 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) is reported. The α‐alkylation products are obtained with moderate to good yields. The method provides an efficient and alternative strategy for the synthesis of the corresponding
Metal-Free Direct Alkylation of Ketene Dithioacetals by Oxidative C(sp<sup>2</sup>
)−H/C(sp<sup>3</sup>
)−H Cross-Coupling
作者:Jiangwei Wen、Fan Zhang、Wenyan Shi、Aiwen Lei
DOI:10.1002/chem.201701664
日期:2017.7.3
The functionalization of internal olefins has been a challenging task in organic synthesis. This protocol provides an efficient and transition‐metal‐freedirect oxidative C(sp2)−H/C(sp3)−H cross‐coupling method to access tetrasubstituted olefins. The push–pull effect from the polarized olefin substrates accelerates the internal olefin C−H alkylation. Importantly, the mechanistic experimental results