Palladium-catalyzed oxidative alkynylation of arene C–H bond using the chelation-assisted strategy
作者:Seok Hwan Kim、Sae Hume Park、Sukbok Chang
DOI:10.1016/j.tet.2012.04.003
日期:2012.7
Palladium-catalyzed alkynylation of arene C–Hbonds with (triisopropylsilyl)acetylene was developed for the first time under oxidative conditions in the present study. Among various type of directing groups examined, the N-phenyl-2-aminopyridine skeleton was shown to be most effective and selective for the Pd-catalyzed direct alkynylationreaction, and the desired alkynylated products were obtained
Iridium(III)-Catalyzed C-7 Selective C–H Alkynylation of Indolines at Room Temperature
作者:Yunxiang Wu、Yaxi Yang、Bing Zhou、Yuanchao Li
DOI:10.1021/jo502596k
日期:2015.2.6
direct C-7 selective C–H alkynylation of indolines at room temperature, for the first time, has been developed via C–H bond activation. Furthermore, the first example of direct C–H alkynylation of carbazoles at the C1 position is also achieved. More importantly, the resulting product can be readily transformed into C7-alkynylated indoles, further widening the C-7 derivatization of indoles and highlighting
Cobalt(III)-Catalyzed Directed C-7 Selective C–H Alkynylation of Indolines with Bromoalkynes
作者:Rui-Han Niu、Jing Zhang、Ru-Yuan Zhao、Quan-Jian Luo、Jin-Heng Li、Bo Sun
DOI:10.1021/acs.orglett.3c01584
日期:2023.7.28
A cobalt(III)-catalyzed directed C-7 alkynylation of indolines with easily accessible bromoalkynes has been developed. The reaction has a broad substrate scope with excellent yields and represents a powerful route to the synthesis of 7-alkynyl-substituted indolines. In addition, the reaction can be extended to the coupling of N-aryl 7-azaindoles, highlighting the synthetic practicability of the strategy
the cobalt-catalyzed C-7 alkynylation of indolines with (bromoethynyl)triisopropylsilane under mild conditions is described, leading to a diverse range of alkynylated indolines in good to excellent yields. Kinetic isotope studies indicate that the formation of a cobaltacycle might be the turnover-limiting step. Additionally, a gram-scale synthesis and oxidation of an indoline to an indole have been carried