作者:Philip Kocienski、Piotr Raubo、Justin K. Davis、F. Thomas Boyle、Donna E. Davies、Audrey Richter
DOI:10.1039/p19960001797
日期:——
Metallated dihydropyran 9 and the dihydropyranone 10 previously used in a synthesis of the insect toxin pederin were adapted to the synthesis of 18-O-methyl mycalamide B, the most potent derivative of the anti-tumour agents isolated from a sponge. Key steps in the synthesis include the oxidation of enol silane 11 from the more hindered face using dimethyldioxirane to introduce the hydroxy group at C-12 and the acylation of 6-lithio-3,4-dihydro-2H-pyran 9 with oxalamide 8 to forge the N-(1-alkoxy-1-alkyl)amide bridge. Biological tests in human tumour cell lines confirm the potent anti-proliferative effect of 18-O-methyl mycalamide B in pM concentrations.
之前用于合成昆虫毒素 pederin 的金属化二氢吡喃 9 和二氢吡喃酮 10 被改用于合成 18-O 甲基霉菌酰胺 B,这是一种从海绵中分离出来的抗肿瘤剂的最有效衍生物。合成的关键步骤包括:用二甲基二氧环己烷氧化烯醇硅烷 11 的受阻面,在 C-12 处引入羟基;用草酰胺 8 对 6-硫代-3,4-二氢-2H-吡喃 9 进行酰化,形成 N-(1-烷氧基-1-烷基)酰胺桥。在人类肿瘤细胞系中进行的生物试验证实,pM 浓度的 18-O- 甲基霉酰胺 B 具有强效的抗增殖作用。