An approach to heterodiarylmethanes via sp2–sp3 Suzuki−Miyaura cross-coupling
作者:Gavin W. Stewart、Peter E. Maligres、Carl A. Baxter、Ellyn M. Junker、Shane W. Krska、Jeremy P. Scott
DOI:10.1016/j.tet.2016.02.030
日期:2016.6
The synthesis of a range of structurally diverse diarylmethanes via the Suzuki−Miyaura cross-coupling of aryl methane acetates and arylboronicacids is reported, including several challenging examples containing nitrogen, oxygen and sulfur heteroatoms in one or both coupling partners. A single set of optimized conditions was used to generate the diarylmethanes in 52–91% yield.
for the ortholithiation of 3-aryl and 3-styryl furans has been uncovered wherein lithiation occurs preferentially at the sterically encumbered 2-position. The results are attributed, at least in part, to stabilization of the intermediate furyl anion by through-space donation of pi-electron density from the substituent appended at the 3-position to the lithium cation. This ortholithiation reaction