Chemistry: natural resins or derivatives; peptides or proteins; – Peptides of 3 to 100 amino acid residues – Cyclic peptides
Patent
1997-11-26
1999-03-30
Tsang, Cecilia J.
Chemistry: natural resins or derivatives; peptides or proteins;
Peptides of 3 to 100 amino acid residues
Cyclic peptides
530333, 514 9, 514 11, A61K 3812, C07K 500, C07K 700, C07K 1700
Patent
active
058891463
ABSTRACT:
This invention is a novel synthesis of BCA-peptides (BCA: bifunctional chelating agents). In this method, the starting material--Fmoc-Thr(ol)-Terephthal-Acetal-Amide Resin is coupled with the various amino acids. The straight peptide-resin of D-Phe-Cys(Trt)-Phe-D-Trp(Boc)-Lys(Boc)-Thr(tBu)-Cys(Trt)-Thr(ol)-Terephtha l-Acetal-Amide Resin was obtained. This compound reacted with iodine to give disulfide-containing peptide resin of ##STR1## Cleavage of the peptide from the resin was achieved by TFA. The cleavaged peptide was protected by the reaction of octreotide with di-t-butyldicarbonate. BCA was coupled to the selectively protected octreotide. This product was obtained by reaction of protected BCA-peptides with TFA. The final product was labeled by radioisotope .sup.111 InCl.sub.3 for tumor imaging radiopharmaceuticals.
REFERENCES:
Krenning et al, J. of Nuclear Medicine, vol. 33 No. 5, pp. 652-658, May, 1992.
Bakker et al, Life Sciences, vol. 49, pp. 1593-1601, 1991.
Chang Shiang-Rong
Chen Shui-Tein
Chyi Shyh-Yi
Huang Tian-Fu
Lee Te-Wei
Institute of Nuclear Energy Research
Marshall S. G.
Tsang Cecilia J.
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