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DOI: 10.1055/s-0030-1260467
Towards a Catalytic Asymmetric Version of the [3+2] Cycloaddition between Hydrazones and Cyclopentadiene
Publication History
Publication Date:
17 May 2011 (online)

Abstract
A novel and easily accessible metal-free catalytic system, an in situ generated BINOL-phosphate-derived silicon Lewis acid, has been described for the [3+2] cycloaddition of N-benzoylhydrazone to cyclopentadiene to afford a cycloadduct in high diastereomeric ratio of 95:5 (syn/anti) and enantiomeric excess of 89%. These results provide insights in the future design and development of highly active and enantioselective silicon Lewis acids for this and other cycloaddition types.
Key words
cycloaddition - silicon - hydrazones - Lewis acids - nitrogen heterocycles
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3-Phenylpropionaldehyde derived hydrazones with other protecting groups like BOC (tert-butyloxycarbonyl) or Ac(acetyl) showed no or little reactivity.