The construction of the three C16-N22 2, C1-C7 6 (as 23) and C8-C15 5 (as 32) segments of the Hsp90 inhibitor herbimycin A (1) is reported. 1-Iodo-3-nitro-2,5-diphenol compound 2 was obtained in 55% yield for 3 steps from the commercially available diiodo derivative 7. Reaction between 1,1-dibromo-alkene 22 and vinyltin 17a using Pd(PPh3)4 or Pd(CH3CN)2Cl2/CuI/diisopropylethylamine, in toluene or DMF at 85 °C, led to enyne 23 in 63% yield (19% overall yield from isopropylidene glyceraldehyde). The synthesis of the C8-C15 sub-unit 32 was performed in 3.4% overall yield for 13 steps, from the commercially available ester 24, with a Hoppe crotylation as a key step.
报告了 Hsp90
抑制剂 herbimycin A(1)的三个 C16-N22 2、C1-C7 6(如 23)和 C8-C15 5(如 32)段的结构。1-Iodo-3-nitro-2,5-diphenol 化合物 2 由市售的二
碘衍
生物 7 经过 3 个步骤制得,收率为 55%。在 85 ℃ 的
甲苯或
DMF 中,使用 Pd(PPh3)4 或 Pd(CH3CN)2Cl2/CuI/diisopropylethylamine 使 1,1-二
溴烯烃 22 与
乙烯基锡 17a 反应,得到炔 23,收率为 63%(从异丙亚基
甘油醛得到的总收率为 19%)。合成 C8-C15 亚基 32 的关键步骤是 Hoppe 弯乙酰化,通过 13 个步骤从市售酯 24 合成,总收率为 3.4%。