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- Title
A Nazarov‐Ene Tandem Reaction for the Stereoselective Construction of Spiro Compounds.
- Authors
Etling, Christoph; Tedesco, Giada; Kalesse, Markus
- Abstract
The different reactivity of trienones under Lewis and Brønsted acids catalysis was investigated, resulting in distinct cyclization products and carbon backbones that originated either from a conjugate Prins cyclization or an interrupted Nazarov cyclization. In particular, an unprecedented Nazarov cyclization tandem reaction is presented, terminating the oxyallyl cation by an ene‐type reaction, and leading stereoselectively to bicyclic spiro compounds. The terminal olefin of this motif represents a useful handle for further functionalization, making it a strategic intermediate in total syntheses. The tandem Nazarov/ene cyclization was shown to be preferred over a Nazarov/[3+2] tandem reaction for all our substrates, independent of chain length. Deuteration studies further support the mechanistic hypothesis of the terminating ene reaction.
- Subjects
SPIRO compounds; STEREOSELECTIVE reactions; ENE reactions; BRONSTED acids; BICYCLIC compounds
- Publication
Chemistry - A European Journal, 2021, Vol 27, Issue 36, p9257
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202101041