Axially Chiral Bifunctional 8,8′-Biquinolyl: Synthesis of 7,7′-Dihydroxymethyl-8,8′-biquinolyl via Pd-Catalyzed Double C–H Oxidation of 7,7′-Dimethyl-8,8′-biquinolyl
作者:Mitsuru Kitamura、Hiroaki Fukuma、Mitsuaki Kobayashi、Shinya Okayama、Tatsuo Okauchi
DOI:10.1021/acs.joc.6b00534
日期:2016.5.6
coupling of 7-methyl-8-bromoquinoline and (ii) Pd(II)-catalyzed double C–H oxidation. Axial chirality of 2 and its synthetic precursor 7,7′-dimethyl-8,8′-biquinolyl (3) is stable. Optically active 2 was obtained through separation of racemic 2 by chiral column HPLC or Pd(II)-catalyzed double C–H oxidation of optically active 3. The absolute stereochemistry of enantiomers of 2 and 3 was determined using the
通过(i)Cu / Pd催化的7-甲基-8-溴喹啉和(ii)Pd的均相偶联,在短时间内合成了双官能C 2对称的7,7'-二羟基甲基-8,8'-联喹啉基(2) (II)催化双CH氧化。2的轴向手性及其合成的前体7,7'-二甲基-8,8'-联喹啉基(3)是稳定的。光学活性物质2是通过手性柱HPLC分离外消旋物2或Pd(II)催化的光学活性物质3的双C–H氧化而获得的。使用激子手性法确定对映体2和3的绝对立体化学。