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DOI: 10.1055/a-1983-2140
Doubly Switchable Diastereodivergent Strategy Mediated by a Chiral Sulfoxide to Access Disubstituted Tetrahydrocyclopentapyranone and Hexahydrocyclopentapyranol Scaffolds via Nazarov Cyclization


Abstract
Activated dienones bearing a chiral sulfoxide were transformed diastereodivergently into the corresponding disubstituted 3,4,5,6-tetrahydrocyclopenta[b]pyran-7(2H)-ones. The torquoselectivity of the reaction could be switched by changing the Lewis acid used as promoter. From the four possible stereoisomers, only the two trans were observed. In a second switchable diastereodivergent step, both corresponding diastereomeric 2,3,4,5,6,7-hexahydrocyclopenta[b]pyran-7-ols were obtained via the diastereoselective reduction of the ketone by changing the reducing agent. The Lewis acids as well as the reducing agents employed in both diastereodivergent steps were achiral, the diastereoselectivities being dictated by the sulfinyl auxiliary.
Key words
asymmetric synthesis - chiral auxiliaries - cyclization - diastereoselectivity - stereoselective synthesisSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-1983-2140.
- Supporting Information
Publication History
Received: 21 September 2022
Accepted after revision: 21 November 2022
Accepted Manuscript online:
21 November 2022
Article published online:
20 December 2022
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