New chiral polyfunctional cyclobutane derivatives from (−)-verbenone: possible surfactant behaviour
摘要:
New enantiopure cyclobutane derivatives have been synthesized from a chiral precursor derived from (-)-verbenone. The cyclobutane moiety acts as a chiral platform to afford a gamma-amino acid function in a branched side-chain containing an additional stereogenic centre as well as additional C-6 or C-15-alkyl chains linked to the ring by means of an amine or an amide function. One of these compounds, obtained as a 1:2 mixture with its TFA salt has been investigated, suggesting behaviour as a good surfactant and its critical micellar concentration has been determined. (C) 2013 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of cyclobutyl γ-amino acids leading to branched peptides with a cyclobutane core
摘要:
Alternative synthetic routes are provided to synthesize gamma-amino acids in their free form or conveniently protected for their selective incorporation into ramified gamma-peptides with a cyclobutane core. The key synthetic-step involves the stereoselective conjugate addition of nitromethane to chiral cyclobutyl alkenoates prepared from (-)-verbenone. (C) 2008 Elsevier Ltd. All rights reserved.
Synthesis of Chiral Cyclobutane Containing <i>C</i><sub>3</sub>-Symmetric Peptide Dendrimers
作者:Raquel Gutiérrez-Abad、Ona Illa、Rosa M. Ortuño
DOI:10.1021/ol1010664
日期:2010.7.16
Five new highly functionalized cyclobutane containing C3-symmetric peptidedendrimers have been synthesized through a convergent approach from 1,3,5-trisubstituted benzene and chiral γ,ε-amino diacid derivatives as well as a γ-tetrapeptide. The first example of the synthesis of N-centered amides by using 1,3,5-triaminobenzene and a carboxylic acid is reported.