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Synthesis and X-ray crystal structure of the dolabellaauricularia peptide dolastatin 18

Pettit, G.R.; Hogan, F.; Herald, D.L.

Journal of Organic Chemistry 69(12): 4019-4022

2004

ISSN/ISBN: 0022-3263
PMID: 15176826
DOI: 10.1021/jo030358o
Accession: 050482680
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A previously synthesized unit of dolastatin 10 (1), dolaphenine (Doe, 3), was converted in four steps to tripeptide 10. Subsequent condensation with carboxylic acid 11 (four steps from Meldrum's acid) provided a practical synthesis of the cancer cell growth inhibitor dolastatin 18 (2, Dhex-(S)-Leu-(R)-N-Me-Phe-Doe). The synthesis of dolastatin 18 (2) confirmed the R stereochemistry of the N-Me-Phe unit as originally assigned and unusual among amino acid components of the sea hare Dolabella auricularia. An X-ray crystal structure determination of dolastatin 18 was also completed.

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