(S)-5-(Trityloxymethyl)pyrrolidin-2-one (1) is an efficient and recyclable chiral auxiliary in the asymmetric Diels–Alder reaction of the imide (2) with dienes, affording cycloadducts (3) with excellent diastereofacial selectivity.
K. Tomioka, N. Hamada, T. Suenaga and K. Koga, J. Chem. Soc., Perkin Trans. 1, 1990, 426 DOI: 10.1039/P19900000426
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