Diastereoselective phenol para-alkylation: access to a cross-conjugated cyclohexadienone en route to resiniferatoxin |
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Authors: | Ritter Tobias Zarotti Pablo Carreira Erick M |
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Institution: | Laboratorium für Organische Chemie, ETH-H?nggerberg, HCI, H335, CH-8093 Zürich, Switzerland. |
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Abstract: | We document a route for the synthesis of a densely functionalized spiro-fused 2,5-cyclohexadienone as an intermediate for the synthesis of resineferatoxin. The strategy is based on an unprecedented diastereoselective, intramolecular phenol para-alkylation to a cross-conjugated cyclohexadienone. In the course of these synthetic studies we developed rapid access to a chiral nitrile possessing a quaternary stereocenter and disclose an unusual acetal rearrangement from a dioxane, which favors the corresponding dioxepane. |
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