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DOI: 10.1055/s-0035-1561278
Regiodivergent Iodocyclizations for the Highly Diastereoselective Synthesis of syn- and anti-Hydroxyl-Isochromanones and -Isobenzofuranones: Concise Synthesis of the Isochromanone Core of the Ajudazols
Publikationsverlauf
Received: 30. September 2015
Accepted after revision: 12. November 2015
Publikationsdatum:
29. Dezember 2015 (online)


Abstract
An efficient synthetic strategy to access hydroxyl-isochromanone and -isobenzofurans from readily available joint alkene precursors by a regiodivergent one-pot iodocyclization–substitution tandem process is reported. The cyclizations proceed with excellent diastereoselectivities, with E-alkenes giving syn-configured products and Z-alkenes giving anti-products. A strong influence of light on the regioselectivity of the reaction was observed. High yields were also observed under radical conditions. The protective-group-free method enables a highly concise synthesis of the authentic isochromanone core of the ajudazols, which are highly potent inhibitors of the mitochondrial respiratory chain.
Key words
natural products - asymmetric synthesis - iodocyclisation - tandem reaction - diastereoselectivitySupporting Information
- Supporting information for this article is available online at http://dx.doi.org/10.1055/s-0035-1561278.
- Supporting Information