Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Aung Tun‐Kyi"'
Publikováno v:
Helvetica Chimica Acta. 59:2196-2200
Synthesis of Deuteriated Derivatives of Diastereomeric Cyclopentapeptides for Use in Conformational Analysis. The syntheses and properties of eight cyclic pentapeptides containing glycine with two deuterium atoms at C(α) (Gly*) are described: cyclo-
Autor:
Aung Tun‐Kyi
Publikováno v:
Helvetica Chimica Acta. 61:1086-1090
2-Thiopyridone (2-mercaptopyridine, 1) was found to be a very suitable reagent for removing the Nα-o-nitrophenylsulfenyl (NPS-) group in both conventional and solid-support peptide synthesis. A 3- to 5-molar excess of the reagent together with an eq
Autor:
Aung Tun‐Kyi, José V. Castell
Publikováno v:
Helvetica Chimica Acta. 62:2507-2510
2-Pyridine sulfenyl chloride (PS-Cl) is a useful reagent for simultaneously deprotecting and activating the mercapto-group of cysteine and of cysteine-peptides preliminary to disufide-bond formation. The S-protecting groups that are amenable to this
Publikováno v:
Helvetica Chimica Acta. 58:415-423
The 1H- and 13C-NMR. spectra of cyclo-tetraglycyl show that the four peptide groups are magnetically equivalent, and different from either a standard trans or a standard cis peptide group. It is suggested that the observed NMR. features correspond to
Autor:
Aung Tun‐Kyi, Robert Schwyzer
Publikováno v:
Helvetica Chimica Acta. 59:1642-1646
The preparation and properties of thirty two N(α)-[2-(p-phenylazophenyl)-isopropylcarbonyl]-amino-acids and derivatives are described. The new coloured protecting group (AZOC-) can be easily and selectively removed with mild acid treatment, much the
Publikováno v:
Helvetica Chimica Acta. 62:2442-2451
Alkali cation complexation and bilayer transport by the bicyclic decapeptides S,S′-bis-cyclo-glycyl-L-hemicystyl-glycyl-glycyl-L-prolyl (1), S, S′-bis-cyclo-glycyl-L-hemicystyl-glycyl-glycyl-D-prolyl (2), S, S′-bis-cyclo-glycyl-L- hemicystyl-sa
Autor:
V. Marly Kriwaczek, Peter W. Schiller, Aung Tun‐Kyi, Alex Eberle, Peter Thanei, Kim Q. Do, Robert Schwyzer, José V. Castell
Publikováno v:
Helvetica Chimica Acta. 62:525-529
As a study preliminary to attempts at photoaffinity and cooperative affinity labelling of cells and cell membrane vesicles bearing opiate receptors, the title compounds were prepared and tested by rat brain membrane binding assays and by a modified g
Publikováno v:
Helvetica Chimica Acta. 68:1-11
Chemical synthesis and biological activities of a new α-melanotropin derivative are described. Nα-(5-Bromovaleryl)-Nα-deacetyl-α-melanotropin contains the 5-bromopentanoyl group as a chemical ‘handle’ in place of the acetyl group of the natur
Autor:
Robert Schwyzer, Aung Tun‐Kyi
Publikováno v:
Helvetica Chimica Acta. 45:859-868
Cyclisation of active esters of the racemic tripeptides glycyl-glycyl-DL-phenylalanine and glycyl-DL-phenylalanyl-glycine as well as of the hexapeptide glycyl-glycyl-DL-phenylalanyl-glycyl-glycyl-DL-phenylalanine (unidentified mixture of diastereoiso
Publikováno v:
Helvetica Chimica Acta. 53:15-27
Using only amino acids occurring in proteins it should, in principle, be possible to synthetize peptide molecules capable of complexing metal cations. The approach described in this contribution is to build cages of oxygen atoms that could contain A-