SOLID-PHASE PEPTIDE SYNTHESIS OF ISOTOCIN WITH AMIDE OF ASPARAGINE PROTECTED WITH 1-TETRALINYL. TRIFLUOROMETHANESULPHONIC ACID (TFMSA) DEPROTECTION, CLEAVAGE AND AIR OXIDATION OF MERCAPTO GROUPS TO DISULPHIDE

  • Amir O. Yusuf Department of Chemistry, University of Nairobi, P.O. Box 30197, Nairobi, Kenya
  • Bhalendu M. Bhatt Department of Chemistry, University of Nairobi, P.O. Box 30197, Nairobi, Kenya
  • Peter M. Gitu Department of Chemistry, University of Nairobi, P.O. Box 30197, Nairobi, Kenya

Abstract

Isotocin, a nonapeptide amide, was synthesised on a benzhydryl-resin using the Boc-strategy. Benzyl group was used in the protection of the side-chains of tyrosine, serine and cysteine. Tetralinyl group was used to protect asparagine side-chain. TFMSA-TFA-thioanisole-1,2-ethanedithiol (2:20:2:1 v/v) was used on the peptide-resin under different cleavage conditions to obtain isotocin in a one-pot reaction. The cleavage at 40 ° C for two hours gave isotocin quantitatively. Isotocin could be isolated in 61% yield.

(Received February 13, 2001; revised August 31, 2001)

Bull.Chem.Soc.Ethiop. 2001, 15(2), 143-150
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Articles

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