A Nonconcerted Intramolecular Diels-Alde
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Latchezar S. Trifonov; Alexander S. Orahovats
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Article
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1989
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John Wiley and Sons
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German
β 395 KB
The reaction between the chiral allenic acid (+)-(S)-1 and the carbodiimides 2 a 4 and the keten-imine 6 gives, under mild conditions, the tricyclic compounds >5,7, and 8. Low diastereoselectivity and a partial loss of optical activity are observed. A stepwise mechanistic pathway oiu a biradical int