A Synthetic Approach toward the Proposed Tetracyclic Aziridinomitosene Derived from FK317
作者:Musong Kim、Edwin Vedejs
DOI:10.1021/jo040211c
日期:2004.10.1
by cyclization and aromatization of the pyrrole ring to give 7. Ester reduction from 7 to 23 was effected via temporary aldehyde protection as the silylimidazole adduct 22, and conversion to the carbamate 25 was carried out using FmocNCO and FMOC cleavage. Structure 25 is the N-trityl-protected derivative of the proposed intermediate from bioactivation of FK317 that is responsible for DNA cross-linking
使用内部迈克尔加成描述了FK317衍生物25的合成。氘代的斯坦尼拉齐啶18的锡-锂交换产生了关键的硫代吡唑烷中间体,然后吡咯环的环化和芳构化得到7。通过暂时的醛保护,如甲硅烷基咪唑加合物22,使酯从7减少到23,并且使用FmocNCO和FMOC裂解进行向氨基甲酸酯25的转化。结构25是NFK317的生物活化引起拟议的中间体的三苯甲基保护的衍生物,该衍生物负责DNA交联。尝试使用MsOH / i- Pr 3 SiH对25进行氮脱保护,结果导致氢化物取代了氨基甲酸C(10)。较稳定的21的脱保护得到所需的氮丙啶26。