(-)-Indolactam-V (1) without a hydrophobic chain at positions 6 and 7 of the indole ring is a weak tumor promoter compared with teleocidin Bs. To investigate the effects of the hydrophobic substituent at position 6 of teleocidin Bs, we synthesized (-)-6-n-octyl-indolactam-V (2) by a palladium-catalyzed coupling reaction from (-)-6-bromo-indolactam-V (7) which had been obtained by microbial conversion with Streptoverticillium blastmyceticum NA34-17 as the key step. (-)-7-n-Octyl-indolactam-V (3) with potent biological activities comparable to those of teleocidin Bs was similarly synthesized from (-)-7-bromo-indolactam-V as a positive control. Compound 2 showed similar biological activities to those of 3, indicating that the effect of the hydrophobic substituent at position 6 of 1 was identical to that at position 7.
与 teleocidin Bs 相比,
吲哚环 6 和 7 位没有疏
水链的 (-)-Indolactam-V (1) 是一种弱肿瘤
促进剂。为了研究 teleocidin Bs 第 6 位疏
水取代基的影响,我们以(-)-6-
溴-
吲哚内酰胺-V (7)为原料,通过
钯催化偶联反应合成了(-)-6-
正辛基-
吲哚内酰胺-V (2)。以(-)-7-
溴-
吲哚内酰胺-V 为阳性对照,同样合成了(-)-7-
正辛基-
吲哚内酰胺-V (3),其
生物活性与 teleocidin Bs 相当。化合物 2 显示出与 3 类似的
生物活性,表明 1 的第 6 位疏
水取代基与第 7 位疏
水取代基的作用相同。