| 摘要 |
Synthesis of dolastatin 3 is accomplished by one amino acid unit addition from L-Pro-OMe employing diethyl phosphorocyanidate-triethylamine for peptide bond formation and N-Boc protection (trifluoroacetic acid cleavage). Thereafter Boc-L-Leu-L-(gln)Thz-(gly)Thz-L-Val-L-Pro-OMe was obtained, successively crystallized from ethanol-diethyl ether, converted to the OPfp active ester, Boc cleavage and cyclization in dioxane containing t-butanol and 4-pyrrolidinopyridine to yield synthetic (-)-dolastatin 3.
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