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A Stable and Recoverable Chiral Ru Lewis Acid: Synthesis, Asymmetric Diels–Alder Catalysis and Structure of the Lewis Acid Methacrolein Complex

✍ Scribed by E. Peter Kündig; Christophe M. Saudan; Gérald Bernardinelli

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 159 KB
Volume: 38
Category: Article
ISSN: 0044-8249
DOI: 10.1002/(sici)1521-3773(19990503)38:9<1219::aid-anie1219>3.0.co;2-d

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✦ Synopsis

Ease of generation, stablity in solution at ambient temperature, high enantioselectivity in Diels-Alder reactions, efficient catalyst recovery, and large rate differences on variation of the anion are all characteristics of the new Ru Lewis acid [CpRu((S,S)-biphop-F)] (biphop-F=(C F ) POCH (Ph)CH (Ph)OP(C F ) ). The structure of complex 1 (L=methacrolein, Y=SbF ) provides evidence for a cooperative binding of the dienophile by both the Lewis acid and the anion.

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