由于其药理学相关性,芳香和杂芳香核的三氟甲基化近年来引起了相当大的兴趣。我们研究了将简单的铜催化三氟甲基化方案扩展到烷氧基取代的碘代吡啶及其苯并类似物。三氟甲基化在所有情况下都顺利进行,所需的化合物被分离和表征。在 3-iodo-4-甲氧基喹啉的三氟甲基化中,我们观察到伴随的 ON 甲基迁移,导致三氟甲基化喹诺酮作为产物。总体而言,所描述的程序应有助于在药物化学中更广泛地使用铜催化的三氟甲基化。
Electrophilic trifluoromethylation of arenes and N-heteroarenes using hypervalent iodine reagents
作者:Matthias S. Wiehn、Ekaterina V. Vinogradova、Antonio Togni
DOI:10.1016/j.jfluchem.2010.06.020
日期:2010.9
The reaction of hypervalentiodine trifluoromethylating reagents with a variety of arenes and N-heteroarenes gives access to the corresponding trifluoromethylated compounds. In comparative studies, 1-trifluoromethyl-1,3-dihydro-3,3-dimethyl-1,2-benziodoxole (2) proved to be the superior to 1-trifluoromethyl-1,2-benziodoxol-3-(1H)-one (1) for the direct aromatic trifluoromethylation. Depending on the
Radical-Based Regioselective C–H Functionalization of Electron-Deficient Heteroarenes: Scope, Tunability, and Predictability
作者:Fionn O’Hara、Donna G. Blackmond、Phil S. Baran
DOI:10.1021/ja406223k
日期:2013.8.14
of substituents exert consistent and additive effects on the regioselectivity of substitution. This allowed us to establish guidelines for predicting regioselectivity on complex π-deficient heteroarenes, including pyridines, pyrimidines, pyridazines, and pyrazines. Since the relative contribution from opposing directing factors was dependent on solvent and pH, it was sometimes possible to tune the regiochemistry