Nickel–NHC-Catalyzed Cross-Coupling of 2-Methylsulfanylbenzofurans with Alkyl Grignard Reagents
摘要:
NiCl2(PPh3)(IPr) catalyzes cross-coupling reactions of 2-methylsulfaylbenzofurans with alkyl Orignard reagents. Other nickel complexes such as NiCl2(dppe) failed to catalyze the same reaction. The alkylation is applicable to the synthesis of a couple of protein tyrosine phosphatase inhibitors, 3-(4-biphenylyl)-2-alkylbenzofurans.
Direct C–H Arylation of Heteroarenes with Copper Impregnated on Magnetite as a Reusable Catalyst: Evidence for CuO Nanoparticle Catalysis in Solution
作者:Suhelen Vásquez-Céspedes、Kathryn M. Chepiga、Nadja Möller、Andreas H. Schäfer、Frank Glorius
DOI:10.1021/acscatal.6b01288
日期:2016.9.2
operationally simple reaction conditions good yields and selectivities were obtained using diaryliodoniumsalts as coupling partners. A combination of experimental methods including kinetic studies, filtration tests, and a series of analytical tools (TXRF, ICP-MS, SEM, XPS, TEM, EFTEM) provide evidence for catalytically active soluble nanoparticles formed from an amorphous heterogeneous precursor. Mechanistic
NiCl2(PPh3)(IPr) catalyzes cross-coupling reactions of 2-methylsulfaylbenzofurans with alkyl Orignard reagents. Other nickel complexes such as NiCl2(dppe) failed to catalyze the same reaction. The alkylation is applicable to the synthesis of a couple of protein tyrosine phosphatase inhibitors, 3-(4-biphenylyl)-2-alkylbenzofurans.