The cyclisation of a meta-phenylene-bis-alanine derivative with several different spacer moieties was investigated. A large difference in the ease of cyclisation was observed depending on which path of cyclisation was chosen. NMR studies indicate that the closed-loop molecules adopt folded conformations with the loop directly above the aromatic ring plane.
A. Ritzén and T. Frejd, J. Chem. Soc., Perkin Trans. 1, 1998, 3419 DOI: 10.1039/A805350B
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