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Conformational studies of cyclol phe l pro gly l pro 2 by carbon 13 nmr

, : Conformational studies of cyclol phe l pro gly l pro 2 by carbon 13 nmr. Chemical & Pharmaceutical Bulletin (Tokyo) 39(6): 1617-1619

The 13C-NMR spectrum (Fig. 2.1) of cyclooctapeptide cyclo(L-Phe-L-Pro-Gly-L-Pro)2 (A) in CDCl3 suggested that its conformation involved the coexistence of two kinds of C2-symmetric conformation with trans-trans-trans-trans and cis-trans-trans-trans forms. Adding 0.5 equivalent of CsSCN or one equivalent of DL-Phe-Ome .cntdot. HCl to the solution of cyclopeptide (A) in CDCl3 yielded 13C-MR spectra (Fig. 2.2 and Table I) which suggested a single C2-symmetric conformation with trans-trans-trans-trans form, resulting from the formation of complexes with CsSCN or DL-Phe-OMe .cntdot. HCl. The 13C-NMR spectrum of complexes of A with DL-Phe-OMe .cntdot. HCl displayed separate resonances2) for Cy, C0,1) Cm,1) C.alpha., and C.beta. of D-Phe-OMe .cntdot. HCl and L-Phe-OMe .cntdot. HCl.


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