Monoligated Pd(0)-catalyzed intramolecular ortho- and para-arylation of phenols for the synthesis of aporphine alkaloids. Synthesis of (−)-lirinine
作者:Malik Hellal、Shambhavi Singh、Gregory D. Cuny
DOI:10.1016/j.tet.2011.12.022
日期:2012.2
palladium(0)-mediated ortho-arylation of phenols applied to the synthesis of various substitutedaporphines is reported. Most significantly, the efficiency of the transformation was enhanced by the use of monoligated Pd(0) complexes. This methodology was extended to para-arylation of phenols and employed in the synthesis of the aporphinealkaloid (−)-lirinine.
Syntheses of Aporphine and Homoaporphine Alkaloids by Intramolecular <i>ortho</i>-Arylation of Phenols with Aryl Halides via S<sub>RN</sub>1 Reactions in Liquid Ammonia
作者:Silvia M. Barolo、Xin Teng、Gregory D. Cuny、Roberto A. Rossi
DOI:10.1021/jo061478+
日期:2006.10.1
The photostimulated intramolecular ortho-arylation reactions of bromoarenes linked with pendant phenoxy containing N-substituted tetrahydroisoquinolines in liquidammonia afforded aporphine (54−82% yield) alkaloid derivatives via SRN1reactions. This strategy was extended for the first time to the synthesis of a homoaporphine derivative (40% yield). Tetrahydroisoquinoline precursors that contained
Synthesis of (±)-aporphine utilizing Pictet–Spengler and intramolecular phenol ortho-arylation reactions
作者:Gregory D. Cuny
DOI:10.1016/j.tetlet.2004.04.194
日期:2004.6
A synthesis of the alkaloid (+/-)-aporphine is reported. The initial key step of the synthesis involves a Pictet-Spengler cyclization of N-tosyl tyramine with 2-bromophenylacetaldehyde in trifluoroacetic acid. This step was followed by the second strategic transformation a palladium-mediated intramolecular phenol ortho-arylation reaction utilizing tricyclohexylphosphine as co-catalysts in the presence of cesium carbonate. Finally, de-oxygenation of the phenol, removal of the tosyl group and methylation gave the desired alkaloid.(C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of Aporphine Analogues via Palladium-Catalyzed Intramolecular Aryl–Aryl Dehydrogenative Coupling
作者:Chen Su、Wen-Hua Xu、Rui-Li Guo、Xing-Long Zhang、Xue-Qing Zhu、Ya-Ru Gao、Yong-Qiang Wang
DOI:10.1021/acs.joc.1c01649
日期:2021.10.1
Reported herein is an intramolecular dehydrogenative coupling of two inert aryl C–H bonds for the synthesis of aporphine analogues. The process represents a novel tool for the preparation of aporphines via palladiun-catalyzed C–H bond activation. The present reaction is compatible with various functional groups, and the coupling products have been further applied for the synthesis of natural products