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 aromatic sp(2) C-H functionalization (a formal C-H activation)
已开发出酚类与芳基卤化物的直接无过渡金属、碱介导的分子内芳基化。在 140 摄氏度的二恶烷中存在 2.5 当量的 t-BuOK 时,3-(2-卤代苄氧基) 苯酚的分子内环化以高产率提供 6H-苯并 [c] 色烯。该反应首先形成苄基中间体,然后进行芳香 sp(2) CH 官能化(正式的 CH 活化)以形成碳-碳键。