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A combination of palladium-catalysed N,O-acetal formation, ruthenium-catalysed ring-closing metathesis and N-sulfonyliminium ion-mediated C–C bond formation constitutes an efficient and versatile route to a set of enantiomerically pure 2,6-disubstituted unsaturated pipecolic acid derivatives.
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Tjen et al. (2000) studied this question.
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