## Abstract 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 same as the 2‐(biphenyl)‐isopropy
Protection during peptide synthesis: Some new directions
✍ Scribed by Geoffrey T. Young
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1981
- Tongue
- English
- Weight
- 251 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
Abstract
Methods available for the protection of the functional groups of amino acids during peptide synthesis are discussed, and attention is drawn to the advantages of side‐chain protection of the 4‐pyridylmethyl type, having increased acid stability and cleaved by mild reductive procedures in the presence of sulfur. The use of S‐diphenyl‐4‐pyridylmethyl‐cysteine and N^im^‐diphenyl‐4‐pyridylmethyl‐histidine is described.
📜 SIMILAR VOLUMES
## Abstract The value of several reagents capable of removing quantitatively the α‐amino protecting group of NPS‐aminoacyl‐ or peptidyl‐derivatives is assessed, by comparison with the reagents currently used, __i.e.__ hydrogen chloride, RS^–^‐nucleophiles or alkyl thioamides, especially with regard
## Abstract The 4‐methoxybenzyl thioether protecting group is deblocked efficiently by oxidation with the homogeneous electron transfer agent tris(4‐bromophenyl)ammoniumyl (**2**^.⊕^) leading to the disulfide in high yields. __S__‐(4‐methoxybenzyl)cysteine derivatives like **9** in this way can be
## Abstract A suitably protected dipeptide of configuration L‐D, __e.g.__ Z‐L‐Ala‐D‐Ala is coupled with an all L alanine peptide, __e.g.__ L‐Ala‐L‐Ala‐ONbAbbreviations according to the IUPAC‐IUB rules, ‘Symbols for Amino‐Acid Derivatives and Peptides, Recommendations (1971)’'. see __e.g.__ J. biol.