Dickinson CF, Yap GPA, Tius MA. Anion-accelerated asymmetric Nazarov cyclization: access to vicinal all-carbon quaternary stereocenters.
Org Biomol Chem 2023;
21:5014-5020. [PMID:
37265330 PMCID:
PMC10372926 DOI:
10.1039/d3ob00735a]
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Abstract
We have developed a catalytic asymmetric Nazarov cyclization that results in the formation of two contiguous all-carbon quaternary stereocenters in high yield with excellent levels of asymmetric induction. This method requires no catalyst recognition elements in the starting materials that are simple diketoesters. Geometrically pure E or Z isomers of the starting material lead to diastereomerically pure products with high enantioselectivity because the species that undergoes cyclization is a rhodium enolate that is configurationally stable.
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