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Conformational studies of proline-, thiaproline- and dimethylsilaproline-containing diketopiperazines

โœ Scribed by Florine Cavelier; Damien Marchand; Patrick Mbassi; Jean Martinez; Michel Marraud

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
150 KB
Volume
12
Category
Article
ISSN
1075-2617

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โœฆ Synopsis

As proline plays an important role in biologically active peptides, many analogues of this residue have been developed to modulate the proportion of cis and trans conformers. A correlation between the pyrrolidine ring shape and structural properties of proline has been established. Diketopiperazine (DKP) is the model of choice to study the influence of the proline ring modification. In this contribution, cyclo(Gly-Pro) and two analogues cyclo(Sip-Pro) and cyclo(Thz-Pro) have been studied with proton NMR. We showed that both analogues with heteroatoms in gamma position, silicon and sulfur respectively, display a more rigid five-member ring. The usual flexibility of proline ring is restrained in both cases and only the two C(beta)-exo and C(beta)-endo conformations are observed.

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