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.