FERNANDEZ, I.;LLERA, J. M.;ZORRILLA, F.;ALCUDIA, F., TETRAHEDRON, 45,(1989) N, C. 2703-2718
作者:FERNANDEZ, I.、LLERA, J. M.、ZORRILLA, F.、ALCUDIA, F.
DOI:——
日期:——
An affinity chromatographic method for the purification of water-insoluble peptides
作者:Irving Sucholeiki、Peter T. Lansbury
DOI:10.1021/jo00058a007
日期:1993.3
A simple and efficient affinity chromatographic method is described for the purification of hydrophobic and/or protected synthetic peptides in organic solvent. This affinity method entails the use of a new protecting group that contains a UV-active disulfide moiety ([2-[(2-nitrophenyl)dithio]-1-phenylethoxy]carbonyl, NpSSPeoc). NpSSPeoc is electrophilic and can be immobilized by a thiolate-disulfide interchange reaction on a thiol-containing solid support. Alternatively, NpSSPeoc can be converted into a nucleophilic thiol ((2-mercapto-1-phenylethoxy)carbonyl, HSPeoc) and immobilized by an electrophilic solid support. NpSSPeoc can be quantified via an Ellman-type assay to measure the amount of full-length peptide at the completion of a solid-phase synthesis before and/or after cleavage from the synthesis resin. NpSSPeoc can be removed with 25% trifluoroacetic acid in methylene chloride. Four peptides incorporating NpSSPeoc at the N-terminus were synthesized. Affinity chromatography was performed on these peptides using 1 % cross-linked polystyrene supports which incorporate a mercury(II) trifluoroacetate, disulfide, alkyl thiol, or iodoacetamide functionality. The results indicate that the highest and most consistent yields of purified peptide are obtained using the combination of HSPeoc and a polystyrene support incorporating the iodoacetamide functionality.
The fixing role of the tert-butyl group in the conformational properties of acyclic sulphur compounds. Synthesis and conformational analysis of 2-tert-butylthioderivatives of 1-phenylethanol and their ο-methyl analogs
作者:I. Fernandez、J.M. Llera、F. Zorrilla、F. Alcudia
DOI:10.1016/s0040-4020(01)80100-9
日期:1989.1
the hydroxylated compounds has been studied by high dilution IR spectroscopy. In all of these derivatives, the bulky But group blocks rotation around the C-S bond. The results for these compounds are compared with those reported for their analogous 2-methylthioderivatives. For sulphones and RR/SS sulphoxides, the possible dihedral angle deformations have also been evaluated.