Synthesis 2023; 55(04): 580-597
DOI: 10.1055/a-1983-2140
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Doubly Switchable Diastereodivergent Strategy Mediated by a Chiral Sulfoxide to Access Disubstituted Tetrahydrocyclopenta­pyranone and Hexahydrocyclopentapyranol Scaffolds via Nazarov Cyclization

Erwann Grenet
a   Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, 1019, route de Mende, 34293 Montpellier, France
,
Arie van der Lee
b   IEM, Université de Montpellier, CNRS, ENSCM, Place Eugène Bataillon, 34095 Montpellier, France
,
Xavier J. Salom-Roig
a   Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, 1019, route de Mende, 34293 Montpellier, France
› Author Affiliations


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.

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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