期刊
ACS CATALYSIS
卷 12, 期 1, 页码 305-315出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c03014
关键词
allenes; C-H propargylation; DFT computations; gallium; kinetic study
资金
- MESR
- UPSaclay
- Ecole polytechnique
- [ANR-18-CE07-0033-01]
This study describes a gallium-catalyzed C-H propargylation of electron-rich arenes using bromoallenes. By using K2CO3 as a base, the side hydroarylation process catalyzed by adventitious protons from the solvent can be bypassed, and the GaCl3/K2CO3 system is found to trigger a wide range of reactions.
A gallium-catalyzed C-H propargylation of electron-rich arenes using bromoallenes is described. The development of this reaction was first hampered by a side hydroarylation process catalyzed by adventitious protons, easily generated from the solvent (1,2-dichloroethane). This hidden Bronsted acid catalysis could be bypassed by using K2CO3 as an insoluble base. The unexpected compatibility of this base with the Lewis acid catalyst GaCl3 allowed a strictly gallium-catalyzed process that was thoroughly studied by kinetics, Ga-71 NMR experiments, and DFT computations. The GaCl3/K2CO3 system triggers the C-H propargylation of a wide range of arenes and heteroaromatics using a variety of bromoallenes.
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