Electrophilic C-12 Building Blocks for Alkaloids: 1,1 Iterative Organoiron-Mediated Routes to (+/-)-Lycoramine and (+/-)-Maritidine

Stephenson, G. R., Roe, C. and Sandoe, E. J. (2011) Electrophilic C-12 Building Blocks for Alkaloids: 1,1 Iterative Organoiron-Mediated Routes to (+/-)-Lycoramine and (+/-)-Maritidine. European Journal of Organic Chemistry (9). pp. 1664-1681. ISSN 1434-193X

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Abstract

Aryllithium reagents generated from protected 6-bromoguaiacol and 2-bromo-4,5-dimethoxybenzyl alcohol derivatives were used to prepare ortho-substituted (1-arylcyclohexadienyl) iron(1+) electrophiles. These were treated with Na+[Me3SiCH2CH2O2CCHCN](-) to build aryl-substituted quaternary centres in new examples of 1,1 iterative {[eta(4)] -> [eta(5)]+ -> [eta(4)] -> [eta(5)]+ -> [eta(4)]} reaction sequences, which make use of the electrophilicity of the metal complex in two key carbon-carbon bond-formation steps. MOM protection of the guaiacol was better than SEM for access to the lycoramine skeleton, and TBDPS was best for maritidine. Decomplexation, hydrolysis, and cyclisation completed formal total syntheses of the Amaryllidaceae alkaloids (+/-)-lycoramine and (+/-)-marididine, establishing the compatibility of the organoiron method with the presence of ortho substituents on the aryl group, and nucleophile addition ipso to the substituted arene.

Item Type: Article
Additional Information: Stephenson, G. Richard Roe, Caroline Sandoe, Elizabeth J.
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Rachel Smith
Date Deposited: 08 Jun 2011 10:46
Last Modified: 16 Jun 2020 23:41
URI: https://ueaeprints.uea.ac.uk/id/eprint/32020
DOI: 10.1002/ejoc.201001394

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