Abstract A concise enantiospecific synthesis of (S)-6,8-bis(methylsulfonyloxy)-octanoic acid (2), a ready precursor of (R)-(+)-α-lipoic acid (1), is reported. The key step of the synthesis is the coupling of the tosylate derived from (R)-malic acid with phenylpropyl magnesium bromide. A recently reported green procedure was used for the oxidative unmasking of the phenyl group, used as a latent carboxyl
摘要报道了 (S)-6,8-双(甲基磺酰氧基)-
辛酸 (2) 的简明对映特异性合成,这是 (R)-(+)-
α-硫辛酸 (1) 的现成前体。合成的关键步骤是将衍生自 (R)-
苹果酸的
甲苯磺酸酯与苯
丙基溴化镁偶联。最近报道的绿色程序用于苯基的氧化暴露,用作潜在的羧基。