Triterpenoid total synthesis. Part 5. Synthetic disproof of the triterpene structure proposed for naurol A, a cytotoxic metabolite of a Pacific sponge
作者:Dai Nozawa、Hirosato Takikawa、Kenji Mori
DOI:10.1039/b002500n
日期:——
Naurol A is a cytotoxic metabolite isolated from a Pacific sponge, and 1 has been proposed as its structure. A mixture of (±)-1 and meso-1′ was synthesized from 4-tert-butyldimethylsilyloxy-3-methylcyclohex-2-en-1-one (6) employing the Stille coupling (10 + 11→1 + 1′) as the key step. Although the synthetic sample (1 + 1′) was a diastereomeric mixture at C-11, its spectral data (IR, UV, 1H and 13C
Naurol A是一种从太平洋海绵中分离出来的细胞毒性代谢产物,有人提出将其结构化为1。(4-)-叔丁基二甲基甲硅烷氧基-3-甲基环己基-2-烯-1-酮(6)使用Stille偶联(10 + 11 → 1 + 1')合成(±)-1和meso - 1'的混合物作为关键步骤。尽管合成样品(1 +1 ')是C-11处的非对映异构体混合物,但其光谱数据(IR,UV,1 H和13C NMR和MS)与报告的A型酚显着不同。因此得出的结论是,A型酚的结构1是错误的。