A family of strong low-molecular-weight organogelators based on aminoacid derivatives
摘要:
A new family of potent aminoacid-type organogelators obtained via an easy and unexpensive way is described. We demonstrated that structural variations onto the side chains of the aminoacid derivatives allowed modulations of the gelation properties. The organogelators bearing a benzyl or an isopropyl group (compounds 1e, 2a, and 2c) are able to provide gelation of apolar solvents at very low concentration ( less than or equal to 0.2 wt%) and to form thermostable gels. (C) 2004 Elsevier Ltd. All rights reserved.
A large number of N-aminodipeptides compounds have been obtained via a Mitsunobu protocol performed in Solution or by solid-phase synthesis. The oligomerization of some of them has been studied in solution or on solid support leading to the formation of 1:1[alpha:alpha-N-amino]mers. (C) 2008 Elsevier Ltd. All rights reserved.
Enantioselective Synthesis of N-Protected α-Amino Acid Hydrazides
A new, mild, general, and efficient synthesis of N-protected α-amino acid hydrazides is described. This two-step preparation uses N-aminophthalimide as protected hydrazine to prepare N-protected α-amino acid hydrazide precursors, and subsequent dephthaloylation with an aminomethyl polystyrene resin yields N-protected α-amino acid hydrazides. It has the advantages of avoiding the use of the toxic hydrazine reagent and being compatible with the most commonly used N-protecting groups. This strategy is particularly interesting in the case of N-(9-fluorenylmethoxycarbonyl)-protected amino acids. Within the limits of chiral HPLC detection, no epimerization is apparent.
A new family of potent aminoacid-type organogelators obtained via an easy and unexpensive way is described. We demonstrated that structural variations onto the side chains of the aminoacid derivatives allowed modulations of the gelation properties. The organogelators bearing a benzyl or an isopropyl group (compounds 1e, 2a, and 2c) are able to provide gelation of apolar solvents at very low concentration ( less than or equal to 0.2 wt%) and to form thermostable gels. (C) 2004 Elsevier Ltd. All rights reserved.