Total synthesis of (+)-fumitremorgin B, its epimeric isomers, and demethoxy derivatives
作者:Shin-ichi Kodato、Masako Nakagawa、Mitsuya Hongu、Tomohiko Kawate、Tohru Hino
DOI:10.1016/s0040-4020(01)85828-2
日期:1988.1
Total synthesis of the title compounds is described. The key intermediate, dehydro-pentacyclic 13, is prepared in a sequence involving Pictet-Spengler reaction and DDQ oxidation. The key step in the synthesis was the dihydroxylation of 13 to afford the cis-diol 54, which was performed by direct oxidation with osmium tetroxide, whereas treatment of 13 with N-bromo-succinimide provided the trans-diol
描述了标题化合物的全合成。关键中间体脱水五环13是按照涉及Pictet-Spengler反应和DDQ氧化的顺序制备的。合成中的关键步骤是将13进行二羟基化,得到顺式二醇54,这是通过用四氧化直接氧化进行的,而用N-溴-琥珀酰亚胺处理13则提供了反式二醇41。 41和54分别给出了13-表-泛泛素B(45)和泛黄素B(1)。13-表-化合物45也通过氧化然后还原而转化为氟莫金B(1)。