在5 bar H 2下,使用RuPHOX-Ru作为手性催化剂,对各种α-取代的丙烯酸进行不对称氢化,从而以高达99%的收率和99.9%ee的产率提供相应的手性α-取代的丙酸。该反应可以以克级进行,具有相对较低的催化剂负载量(最高5000 S / C),所得产物(97%,99.3%ee)可用作构建生物活性手性分子的关键中间体。该不对称方案已成功应用于二氢青蒿酸的不对称合成,这是抗疟疾药物青蒿素工业合成所需的关键中间体。
在5 bar H 2下,使用RuPHOX-Ru作为手性催化剂,对各种α-取代的丙烯酸进行不对称氢化,从而以高达99%的收率和99.9%ee的产率提供相应的手性α-取代的丙酸。该反应可以以克级进行,具有相对较低的催化剂负载量(最高5000 S / C),所得产物(97%,99.3%ee)可用作构建生物活性手性分子的关键中间体。该不对称方案已成功应用于二氢青蒿酸的不对称合成,这是抗疟疾药物青蒿素工业合成所需的关键中间体。
A simple nickel catalyst converts terminal alkynes and formic acid to α-chiral carboxylic acids in high enantioselectivity. The reaction proceeds via the hydrocarboxylation of alkynes and enantioselective transfer hydrogenation of acrylic acids.
Simultaneous control of regioselectivity and enantioselectivity in the hydroxycarbonylation and methoxycarbonylation of vinyl arenes
作者:Tina M. Konrad、Jamie T. Durrani、Christopher J. Cobley、Matthew L. Clarke
DOI:10.1039/c3cc41291a
日期:——
Using a family of novel mononuclear and dinuclear palladium complexes of phanephos ligands, the simultaneous control of regioselectivity and enantioselectivity in the hydroxycarbonylation and alkoxycarbonylation of styrene derivatives has been realised for the first time.
A new series of C2-symmetrical chiral ferrocene-based diphosphino-ethane ligands termed as f-DPE were developed. Assisted by the ion pairing interaction with the ligand, a wide scope of 2-substituted acrylic acids was hydrogenated to obtain chiral propanoic acids with high yields and enantioselectivities. The well-known anti-inflammatory drugs ibuprofen, naproxen, and flurbiprofen could be synthesized