Total Synthesis of the Cyclodepsipeptide Apratoxin A and Its Analogues and Assessment of Their Biological Activities
作者:Dawei Ma、Bin Zou、Guorong Cai、Xiaoyi Hu、Jun O. Liu
DOI:10.1002/chem.200600599
日期:2006.10.5
A novel total synthesis of apratoxin A is described, with key steps including the assembly of its ketide segment through a D-proline-catalyzed direct aldol reaction and Oppolzer's anti aldol reaction and the preparation of its thiazoline unit in a biomimetic synthesis. An oxazoline analogue of apratoxin A has also been elaborated by a similar approach. This compound has a potency against HeLa cell
描述了一种新颖的全合成Apratoxin A,其关键步骤包括通过D-脯氨酸催化的直接羟醛反应和Oppolzer的抗羟醛反应组装其酮化物片段,并在仿生合成中制备其噻唑啉单元。甲毒素A的恶唑啉类似物也已通过类似的方法进行了精心设计。该化合物具有抗HeLa细胞增殖的能力,仅略低于Apratoxin A的能力,而Aptoxin A的C(40)-去甲基化的恶唑啉类似物显示出低得多的细胞毒性,C(37)-顶基和C(37)的去甲基化该新类似物的产品无效。这些结果表明,C(37)和C(40)处的两个甲基以及C(37)处的立体化学对于Apratoxin A的恶唑啉类似物的有效细胞活性至关重要。