Any hydrocarbon or heterocycle with 4n+2 electrons in a fully conjugated cyclic π system is considered to be an...
Buchler Glossary
Tamura Cyclization
In the presence of a Cinchona squaramide-based catalyst, enolizable anhydrides react with alkylidene oxindoles to generate spirooxindole products with excellent enantio- and diastereocontrol.
Tamura cyclization examples catalyzed by cinchona alkaloid derivatives can be found in our free of charge Chiral Catalyst Search.
Example from Literature
Catalytic Asymmetric Tamura Cycloadditions. (Manoni, F., Connon, S. J.; Angew. Chem. Int. Ed. 2014, 53, 2628-2632.)
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