We have described the synthesis of the two complex units (2R,3R,4S)-dolaproine (Dap) and (3R,4S,5S)-dolaisoleuine (Dil) of dolastatin 10 from natural amino acids. The stereoselective syntheses of N-Boc-Dap (4a) and N-Boc-(2S)-iso-Dap (4b) were performed by employing crotylation of N-Boc-l-prolinal as a key step. Barbier-type allylation of N-Boc-l-isoleucinal provided a mild and convenient approach for the synthesis of N-Boc-Dil (5a) and N-Boc-(3S)-iso-Dil (5b). Ten dolastatin 10 analogues have been designed and synthesized with N-terminal modifications based on the known compound monomethylauristatin F (MMAF, 3). In comparison with MMAF (3), four of the compounds showed enhanced potency against HCT 116 human colon cancer cells in vitro.

我们已经描述了从天然氨基酸合成dolastatin 10的两个复杂单元（2 R，3 R，4 S）-dolaproine（Dap）和（3 R，4 S，5 S）-dolaisoleuine（Dil）的合成。的立体选择性合成N-的Boc-DAP（4A）和Ñ -Boc-（2小号） -异-Dap（图4b）中采用的crotylation进行Ñ -Boc-升脯氨醛作为关键步骤。N - Boc- 1-异亮氨酸的Barbier型烯丙基化为合成N - Boc- 1-异丁香提供了温和而方便的方法Ñ -Boc-语（图5a）和Ñ -Boc-（3小号） -异-Dil（图5b）。基于已知的化合物单甲基auristatin F（MMAF，3），已经设计并合成了具有N末端修饰的十个dolastatin 10类似物。与MMAF（3）相比，其中四种化合物在体外显示出对HCT 116人结肠癌细胞的增强效力。