catalytic strategy: A highly efficient oxidation of a representative series of sec‐alcohols and diols with aq. NaOCl and 2‐azaadamantane N‐oxyl (AZADO) as organocatalyst was combined with a selective ketoreductase‐catalyzed bioreduction. The sequential one‐pot strategy, performed up to 100 mm of final substrate, yields benzyl, non‐benzyl, or hindered biaryl alcohols with very high yield and >99 % ee.
混合催化策略:用仲水高效氧化一系列代表性的仲醇和二醇。NaOCl和2-氮杂金刚烷N-氧基(AZADO)作为有机催化剂与选择性酮还原酶催化的生物还原相结合。连续一锅法在最终基材上进行了长达100 m m的反应,可制得苄基,非苄基或受阻联芳基醇,收率非常高,ee大于99%。
Asymmetric Synthesis of Biaryl Diols via Dynamic Kinetic Resolution
作者:Jeonghun Cho、Kyungwoo Kim、Jaiwook Park、Mahn‐Joo Kim
DOI:10.1002/bkcs.12337
日期:2021.7
We have developed a protocol incuding dynamic kinetic resolution as the key step for the asymmetricsynthesis of biaryl diol stereoisomers. The two aryl alkanols as the starting materials were cross-coupled by palladium catalysis to give dl- and meso-diol, which were then subject to chemoenzymatic dynamic kinetic resolution (DKR) for the transformation into single stereoisomeric diol diester. Diol
我们开发了一个协议,包括动态动力学分辨率作为联芳二醇立体异构体不对称合成的关键步骤。两个芳基链烷醇作为起始材料是交叉耦合的由钯催化,得到DL -和内消旋-二醇,然后将其经受化学酶促动态动力学拆分( DKR)用于转化成单立体异构体的二醇二酯。二醇二酯最终脱酰化得到相应的联芳二醇立体异构体。化学酶促 DKR 使用基于钌的外消旋化催化剂和 ( R ) 选择性脂蛋白脂肪酶进行。总共 17 ( R , R )-二醇,包括 7 C 2合成了具有优异对映纯度 (>99% ee ) 的 -对称二醇。