phenols were prepared and investigated by 1H and 13C NMR spectroscopy in chloroform-d1 solution. The chemical shifts of intramolecular hydrogen-bonded protons in Mannich bases depend on the pKa of the parent phenols. A correlation between Hammett's constants, σp, and 13C NMR chemical shifts of para carbon atoms has been found. All the results obtained from 1H and 13C NMR spectra show that in the case
Cu(II)-Catalyzed <i>ortho</i>-Selective Aminomethylation of Phenols
作者:Jin-Ling Dai、Nan-Qi Shao、Jin Zhang、Run-Ping Jia、Dong-Hui Wang
DOI:10.1021/jacs.7b06785
日期:2017.9.13
A Cu(II)-catalyzed ortho-selective functionalization of free phenols with trifluoroborates to afford Csp2-Csp3 coupling products under mild conditions has been developed. A variety of functional groups on the phenol and the potassium aminomethyltrifluoroborate substrates were found compatible, furnishing the corresponding products in moderate to excellent yields. A single-electron transfer radical