Origin of High Diastereoselectivity in Reactions of Seven-Membered-Ring Enolates.
Olga LavindaCollin H WittK A WoerpelPublished in: Angewandte Chemie (International ed. in English) (2022)
Unlike many reactions of their six-membered-ring counterparts, the reactions of chiral seven-membered-ring enolates are highly diastereoselective. Diastereoselectivity was observed for a range of substrates, including lactam, lactone, and cyclic ketone derivatives. The stereoselectivity arises from torsional and steric interactions that develop when electrophiles approach the diastereotopic π-faces of the enolates, which are distinguished by subtle differences in the orientation of nearby atoms of the ring.
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