obtaining L1 were explored, affording the synthesis of the new intermediate 4, a versatile building block for further functionalized branched macrocyclic hosts. The binding properties of both ligands towards the halides series and acetate anions (G) were investigated by NMR and UV-Vis spectroscopy in a dimethyl sulfoxide–0.5% water solution. Both ligands interact with F−, Cl− and AcO− while Br− and I− did
A compound having the formula ##STR1## in which R.sub.1 is an aminoalkyl group and ##STR2## is an acyl group and salts thereof having high antibiotic activity and being substantially free of lytic activity are described.
Protocol for the Incorporation of γ-Amino Acids into Peptides: Application to (−)-Shikimic Acid Based 2-Amino-Methylcyclohexanecarboxylic Acids
作者:Marcos A. González、Amalia M. Estévez、María Campos、Juan C. Estévez、Ramón J. Estévez
DOI:10.1021/acs.joc.7b02671
日期:2018.2.2
The first example of a new protocol for the incorporation of γ-amino acids into peptides is reported. It involved a shikimic acid based stereoselectivesynthesis polyhydroxylated-2-nitromethylcyclohexanecarboxylic acids, which were directly incorporated into peptides.
Asymmetricaccess to novel N-protected (di)peptidylβ3-aldehydes (“β3-PAs”) has been achieved through direct coupling of a chiral non-racemic 6-alkoxytetrahydrooxazinone with N-phthalyl L-α-amino acids. Kinetic resolution allows for the fruitful use of racemic amino acids in this process. Acidic hydrolysis of the diastereomerically pure, coupling products leads to the title N-phthalyl-β3-PAs in high
The present invention is directed to novel carba cyclohexapeptide compounds of the formula ##STR1## where all substituents are defined herein, which are useful as antifungal agents and for the treatment of Pneumocystis carinii infections. Compositions containing the compounds of the invention are also disclosed.