Taking advantage of lithium monohalocarbenoid intrinsic α-elimination in 2-MeTHF: controlled epoxide ring-opening <i>en route</i> to halohydrins
作者:Laura Ielo、Margherita Miele、Veronica Pillari、Raffaele Senatore、Salvatore Mirabile、Rosaria Gitto、Wolfgang Holzer、Andrés R. Alcántara、Vittorio Pace
DOI:10.1039/d0ob02407d
日期:——
The intrinsic degradative α-elimination of Li carbenoids somehow complicates their use in synthesis as C1-synthons. Nevertheless, we herein report how boosting such an α-elimination is a straightforward strategy for accomplishing controlled ring-opening of epoxides to furnish the corresponding β-halohydrins. Crucial for the development of the method is the use of the eco-friendly solvent 2-MeTHF, which
We achieved intra- and intermolecular C(sp3)–H alkoxylation of benzylic positions of heteroaromaticcompounds using CuBrn (n = 1, 2)/5,6-dimethylphenanthroline (or 4,7-dimethoxyphenanthroline) and (tBuO)2 as a catalyst and an oxidant, respectively. The reaction proceeded at both terminal and internal benzylic positions of the alkyl groups. The intramolecular alkoxylation was performed on a gram scale