Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2016, Issue 9, Pages 1708-1713Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201501621
Keywords
Synthetic methods; Asymmetric catalysis; Cycloaddition; Carbocations; Trityl ion
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Funding
- Swedish Research Council (VR)
- Chinese Scholarship Council (CSC)
- Wenner-Gren Foundations
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In recent years the carbocation has re-emerged as a highly efficient Lewis acid catalyst for a variety of organic transformations. However, the goal of asymmetric carbocation catalysis has so far been out of reach mainly as a result of difficulties associated with the preparation of stable chiral carbocations. Here, we describe developments towards asymmetric carbocation catalysis based on the concept of chiral-anion-directed catalysis. Chiral tritylium salts can be conveniently prepared in situ by mixing trityl chloride derivatives with chiral phosphonate, phosphoramide, bis(sulfonyl) amide, and bis(sulfuryl) amide silver or sodium salts. It is shown that the bis(sulfuryl) amide/tritylium ion salt catalyzes the Diels-Alder reaction with an up to 53 % enantiomeric excess.
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