A Nonconcerted IntramolecularDiels-Alder Reaction of Chiral Allenic-Acid Derivatives
作者:Latchezar S. Trifonov、Alexander S. Orahovats
DOI:10.1002/hlca.19890720108
日期:1989.2.1
The reaction between the chiral allenic acid (+)-(S)-1 and the carbodiimides 2a–d and the keten-imine 6 gives, under mild conditions, the tricyclic compounds 3–5, 7, and 8. Low diastereoselectivity and a partial loss of opticalactivity are observed. A stepwise mechanistic pathway via a biradical intermediate is postulated.