A ring-closing metathesis-mediated route to novel enantiopure conformationally restricted cyclic amino acidsElectronic supplementary information (ESI) available: characterisation data for compounds 7, 9 and 16. See http://www.rsc.org/suppdata/cc/b0/b001253j/
Abstract
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.