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Volumn 9, Issue 5, 2003, Pages 1096-1103

Solid-phase synthesis of the cyclic lipononadepsipeptide [N-Mst(Ser1), D-Ser4, L-Thr6, L-Asp8, L-Thr9]syringotoxin

Author keywords

Antimicrobial peptides; Cyclic peptides; Didehydroamino acids; Leishmania; Peptides; Protecting groups

Indexed keywords

SOLUBILITY; SYNTHESIS (CHEMICAL); WATER;

EID: 0347294696     PISSN: 09476539     EISSN: None     Source Type: Journal    
DOI: 10.1002/chem.200390126     Document Type: Article
Times cited : (8)

References (43)
  • 6
    • 0347546730 scopus 로고    scopus 로고
    • unpublished results
    • R. Lozano, unpublished results.
    • Lozano, R.1
  • 7
    • 0033517487 scopus 로고    scopus 로고
    • B. L. Herwaldt, Lancet 1999, 354, 1191-1199.
    • (1999) Lancet , vol.354 , pp. 1191-1199
    • Herwaldt, B.L.1
  • 10
    • 33748501367 scopus 로고
    • K. Barlos, D. Gatos, W. Schäfer, Angew. Chem. 1991, 103, 572-575; Angew. Chem. Int. Ed. Engl. 1991, 30, 590-593.
    • (1991) Angew. Chem. Int. Ed. Engl. , vol.30 , pp. 590-593
  • 15
    • 0346915729 scopus 로고    scopus 로고
    • note
    • Fmoc-Thr(tBu)-OSu was prepared as was described in the experimental from the available amino acid Fmoc-Thr(tBu)-OH and HOSu (2 equiv) in the presence of DIPCDI (1.3 equiv). This reagent ratio was necessary to avoid formation of the inactive N-acylurea derivative of Fmoc-Thr(tBu)-OH.
  • 16
    • 0346915730 scopus 로고    scopus 로고
    • note
    • Attempts to prepare Fmoc-Thr(tBu)-Thr-Oallyl from Fmoc-Thr(tBu)-OH and HCl·H-Thr-Oallyl by using carbodiimide-based methods (EDC·HCl/DIEA, DIPCDI/DIEA, DIPCDI/HOBt/DIEA) led to incomplete dipeptide formation, presumably due to some degree of steric hindrance between the two β-branched amino acids.
  • 18
    • 0348176371 scopus 로고    scopus 로고
    • note
    • [12]), in this case a by-product (18%) was obtained that could be a cyclic compound with the carbodiimide serving as a bridge between the OH of the Thr and the C-carboxyl group. This result, which requires the replacement of the allyl group by EDC, was verified by the use of the phenacyl group as a carboxylic acid protecting group. In this case the acetophenone is a better leaving group and, consequently, a larger amount of the same by-product was obtained (35%).
  • 20
    • 0347546729 scopus 로고    scopus 로고
    • note
    • [12] This result can be interpreted in terms of the steric hindrance between β-branched residues.
  • 22
    • 0346285680 scopus 로고    scopus 로고
    • note
    • Unreacted reactive sites were capped with MeOH/DIEA.
  • 23
    • 0347546728 scopus 로고    scopus 로고
    • note
    • DKP formation is favored by the presence of Gly.
  • 29
    • 0034676583 scopus 로고    scopus 로고
    • and references therein
    • As the activation of the carboxyl function is more demanding in this case, the use of the most reactive amidium salts, such as N-[(dimethylamino)-1H-1,2,3-triazolo-[4,5-b]pyridin-1-yl-methylene]- N-methylmethanaminium hexafluorophosphate N-oxide (HATU), is not recommended because HATU can react with the free amino function of the amino acid bound to the resin. This produces a guanidinium species with concomitant termination of the peptide: M. del Fresno. A. El-Faham, L.A. Carpino, M. Royo, F. Albericio, Organic Lett. 2000, 2, 3539-3542, and references therein.
    • (2000) Organic Lett , vol.2 , pp. 3539-3542
    • Del Fresno, M.1    El-Faham, A.2    Carpino, L.A.3    Royo, M.4    Albericio, F.5
  • 31
    • 0346915728 scopus 로고    scopus 로고
    • note
    • The presence of DIEA avoids the trifluoroacetylation of the free amine function.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.