Chiral DBFOX/Ph Complex Catalyzed Enantioselective Nitrone Cycloadditions to α,β-Unsaturated Aldehydes
作者:Moto Shirahase、Shuji Kanemasa、Yoji Oderaotoshi
DOI:10.1021/ol0361148
日期:2004.3.1
1,3-Dipolar cycloadditions of nitrones with alpha-alkyl- and alpha-arylacroleins are catalyzed with the DBFOX/Ph complexes of nickel(II) and magnesium(II) salts to produce the sterically controlled isoxazolidine-5-carbaldehydes, while the reactions with alpha-bromoacrolein are effectively catalyzed with the zinc(II) complexes to produce the electronically controlled isoxazolidine-4-carbaldehydes.
用镍盐(II)和镁盐(II)的DBFOX / Ph络合物催化硝酮与α-烷基和α-丙烯醛的1,3-偶极环加成反应,生成空间控制的异恶唑烷-5-甲醛。锌(II)配合物可有效催化α-溴丙烯醛的合成,以产生电子控制的异恶唑烷-4-甲醛。在室温下进行的反应中观察到高达99.5%ee的对映选择性。[反应:看文字]