Four derivatives of the neurohypophysial hormone oxytocin deuterated at the α and β positions of the two half-cystine residues have been synthesized. The substituted amino acid Boc-S-benzyl-DL-[α,β,β-2H3]cysteine was used to prepare [1-hemi-DL-[α,β,β-2H3]cystine]oxytocin and [6-hemi-DL-[α,β,β-2H3]cystine]oxytocin. The diastereomeric mixtures were separated and purified by partition chromatography and gel filtration to give [1-hemi-L-[α,β,β-2H 3]cystine]oxytocin,1ri[1-hemi-D-[α,β,β- 2H3]cystine]oxytocin, [6-hemi-L-[α,β,β-2H3]cystine]oxytocin, and [6-hemi-D-[α,β,β-2H3]cystine]oxytocin. The former two compounds were prepared by both solid-phase and solution techniques of peptide chemistry, and the two methods were compared in the synthesis of these derivatives. The solid-phase method was considerably faster and gave better overall yields, while the solution method permitted a slightly more conservative use of deuterated amino acid. It was found that much shorter deprotection and coupling times and much smaller excesses of amino acid were compatible with the solid-phase methodology.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Organic Chemistry|
|Publication status||Published - 1974|
ASJC Scopus subject areas
- Organic Chemistry