Palladium mediated bis- and tris-biaryl Heck coupling for the synthesis of heterocycles
摘要:
A simple and straightforward palladium mediated ligand free bis- and tris-biaryl coupling on an unactivated phenylbenzyl ether system to produce hitherto unreported heterocyclic compound is described. (C) 2008 Elsevier Ltd. All rights reserved.
Palladium mediated bis- and tris-biaryl Heck coupling for the synthesis of heterocycles
摘要:
A simple and straightforward palladium mediated ligand free bis- and tris-biaryl coupling on an unactivated phenylbenzyl ether system to produce hitherto unreported heterocyclic compound is described. (C) 2008 Elsevier Ltd. All rights reserved.
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)
Palladium mediated bis- and tris-biaryl Heck coupling for the synthesis of heterocycles
作者:K.C. Majumdar、S. Chakravorty、N. De
DOI:10.1016/j.tetlet.2008.03.118
日期:2008.5
A simple and straightforward palladium mediated ligand free bis- and tris-biaryl coupling on an unactivated phenylbenzyl ether system to produce hitherto unreported heterocyclic compound is described. (C) 2008 Elsevier Ltd. All rights reserved.