Synthesis of dolastatin 15
First Claim
1. A method of synthesizing dolastatin 15 comprising the steps of:
- coupling tripeptide (8) and tripeptide (5b) to form peptide (9a);
hydrogenating said peptide (9a) to form peptide (9b);
coupling said peptide (9b) with Dov to form dolastatin 15; and
isolating said dolastatin 15.
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Abstract
The present invention relates to the synthesis of natural (-)- dolastatin and the elucidation of the absolute configuration of this important sea hare constituent. A segment synthetic strategy was utilized for obtaining the Dolabella auricularia (Indian Ocean sea hare) depsipeptide dolastatin 15. Reaction of protected (S)-Hiva-(S)-Phe (2c) with isopropenyl chloroformate followed by Meldrum'"'"'s ester, cyclization (2c→3a) of the product in toluene and finally methylation afforded the key (S)-dolapyrrolidine (Dpy) derivative (3b). Condensation of tripeptide (8) with the three unit Dpy segment (5b) followed by deprotection and coupling (diethyl phosphorocyanidate) led to dolastatin 15 in 11% overall yield. The powerful and selective activity of dolastatin 15 against the U.S. National Cancer Institute'"'"'s panel of human cell lines is reported.
84 Citations
19 Claims
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1. A method of synthesizing dolastatin 15 comprising the steps of:
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coupling tripeptide (8) and tripeptide (5b) to form peptide (9a); hydrogenating said peptide (9a) to form peptide (9b); coupling said peptide (9b) with Dov to form dolastatin 15; and isolating said dolastatin 15. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of synthesizing dolastatin 15 comprising the steps of:
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a) coupling tripeptide (8) and peptide (5b) with diethylphosphorocyanidate (DEPC) to form peptide (9a), b) deprotecting peptide (9a) by hydrogenolysis to form peptide (9b), c) coupling peptide (9b) and Dov with DEPC to form dolastatin 15, and d) isolating said dolastatin 15. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification