通过新颖的钯催化,银促进的环丙基苯甲酰胺的分子内环化反应,合成了许多难以获得的苯并[ c ]氮杂-1-酮。这种生物学上重要的分子类别是从容易获得的起始原料以高效且高产的方式制备的。芳基溴化物和碘化物都是有效的转化底物。机理研究表明,该反应通过环丙基C(sp 3)–H裂解步骤进行,然后进行开环,去质子化和还原消除反应。
Mild Rhodium(III)-Catalyzed Cyclization of Amides with α,β-Unsaturated Aldehydes and Ketones to Azepinones: Application to the Synthesis of the Homoprotoberberine Framework
作者:Zhuangzhi Shi、Christoph Grohmann、Frank Glorius
DOI:10.1002/anie.201301426
日期:2013.5.10
Seven! The title reaction can be described as an intermolecular annulation involving tandemCHactivation, cyclization to give the seven‐membered ring, and condensation steps. Biologically interesting azepinone derivatives can be prepared in this way. The synthetic potential of this method was demonstrated by the construction of the homoprotoberberine ring system.
Enantioselective palladium(0)-catalyzed intramolecular cyclopropane functionalization: access to dihydroquinolones, dihydroisoquinolones and the BMS-791325 ring system
作者:J. Pedroni、T. Saget、P. A. Donets、N. Cramer
DOI:10.1039/c5sc01909e
日期:——
Taddol-based phosphoramidite ligands enable enantioselective palladium(0)-catalyzedC-Harylation of cyclopropanes. The cyclized products are obtained in high yields and enantioselectivities. The reported method provides an efficient access to a broad...