Highly Enantioselective Iridium-Catalyzed Hydrogenation of 2-Benzylquinolines and 2-Functionalized and 2,3-Disubstituted Quinolines
作者:Da-Wei Wang、Xiao-Bing Wang、Duo-Sheng Wang、Sheng-Mei Lu、Yong-Gui Zhou、Yu-Xue Li
DOI:10.1021/jo900073z
日期:2009.4.3
The enantioselectivehydrogenation of 2-benzylquinolines and 2-functionalized and 2,3-disubstituted quinolines was developed by using the [Ir(COD)Cl]2/bisphosphine/I2 system with up to 96% ee. Moreover, mechanistic studies revealed the hydrogenation mechanism of quinoline involves a 1,4-hydride addition, isomerization, and 1,2-hydride addition, and the catalytic active species may be a Ir(III) complex
通过使用[Ir(COD)Cl] 2 /双膦/ I 2体系(ee高达96%)开发了2-苄基喹啉和2-官能化和2,3-二取代喹啉的对映选择性氢化。而且,机理研究表明,喹啉的氢化机理涉及1,4-氢化物的加成,异构化和1,2-氢化物的加成,并且催化活性物质可以是与氯化物和碘化物的Ir(III)络合物。
α‐Chymotrypsin–catalyzed direct C (Sp<sup>3</sup>)–H functionalization reactions for synthesis of azaarene derivatives in water
α‐Chymotrypsin from the bovine pancreas has been shown for the first time to display catalytic nonnatural catalytic ability toward the C (sp3)–H functionalization reaction of 2‐methylquinoline and aromatic aldehydes in water. α‐Chymotrypsin exhibited favorable catalytic activity with good adaptability to different substrates. The activity of the enzyme could be improved by adjusting the solvent, temperature