A library of 72 quinolones was synthesized from substituted anthranilic acids, using ynone intermediates. These masked beta-dicarbonyl synthons allowed cyclization under milder conditions than previously reported quinolone syntheses. (C) 2009 Elsevier Ltd. All rights reserved
作者:Timothy R. Ward、Brandon J. Turunen、Torsten Haack、Benjamin Neuenswander、William Shadrick、Gunda I. Georg
DOI:10.1016/j.tetlet.2009.09.024
日期:2009.11
A library of 72 quinolones was synthesized from substituted anthranilic acids, using ynone intermediates. These masked beta-dicarbonyl synthons allowed cyclization under milder conditions than previously reported quinolone syntheses. (C) 2009 Elsevier Ltd. All rights reserved
Ligand‐Enabled γ‐C(sp
<sup>3</sup>
)−H Olefination of Free Carboxylic Acids
We report the ligand‐enabled C−H activation/olefination of freecarboxylicacids in the γ‐position. Through an intramolecular Michael addition, δ‐lactones are obtained as products. Two distinct ligand classes are identified that enable the challenging palladium‐catalyzed activation of freecarboxylicacids in the γ‐position. The developed protocol features a wide range of acid substrates and olefin