The tumor promoter (–)-indolactam-V (1) exists in two stable conformers (twist and sofa) due to isomerization of the amide group. Indolactone-V (2), the lactone analogue of 1, has been synthesized to investigate the effects of the amide group on its conformation and biological activities. Indolactone-V (2) existed only as the inactive sofa-like conformer, indicating that the amide group of 1 plays a critical role in formation of the active twist conformation.
肿瘤
促进剂(–)-
吲哚内酯-V(1)由于酰胺基团的异构化而存在两种稳定的构象(扭转型和沙发型)。合成了
吲哚内酯-V(2),作为1的
内酯类似物,以研究酰胺基团对其构象和
生物活性的影响。
吲哚内酯-V(2)仅以无活性的沙发型构象存在,这表明1的酰胺基团在活跃的扭转构象的形成中起着关键作用。