American Chemical Society
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Comparative Study of the Synthesis and Structural and Physicochemical Properties of Diketopiperazines vs Aza-diketopiperazines

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posted on 2017-02-23, 00:00 authored by Pierre Regenass, Damien Bosc, Stéphanie Riché, Patrick Gizzi, Marcel Hibert, Lydia Karmazin, A. Ganesan, Dominique Bonnet
Aza-diketopiperazines (aza-DKPs) represent an underprivileged motif obtained by scaffold hopping of 2,5-diketopiperazines (2,5-DKPs). Herein, we compare the synthesis and the structural and physicochemical properties of aza-DKP 4 vs 2,5-DKP 7. Thus, X-ray and 1H NMR studies show that aza-DKP 4 is a rigid and nonflat scaffold like the 2,5-DKP 7. Moreover, the replacement of one Cα-stereogenic center by a nitrogen atom results in a significant improvement of both the water solubility and the microsomal stability.