Direct Transition-Metal-Free Intramolecular Arylation of Phenols
作者:Gan B. Bajracharya、Olafs Daugulis
DOI:10.1021/ol801897m
日期:2008.10.16
base-mediated intramolecular arylation of phenols with aryl halides has been developed. In the presence of 2.5 equiv of t-BuOK in dioxane at 140 degrees C, the intramolecular cyclization of 3-(2-halobenzyloxy)phenols affords 6H-benzo[c]chromenes in high yields. This reaction proceeds by an initial formation of a benzyne intermediate followed by an aromaticsp(2) C-H functionalization (a formal C-H activation)