Enantioselective One-Pot Synthesis of α-Amino Esters by a Phosphine-Catalyzed [3+2]-Cycloaddition Reaction
作者:Marianne Steurer、Kim L. Jensen、Dennis Worgull、Karl Anker Jørgensen
DOI:10.1002/chem.201103502
日期:2012.1.2
Phosphines go one‐pot: The one‐pot synthesis of cyclic α‐amino esters from azlactones and allenes by a phosphine‐catalyzed [3+2]‐cycloaddition reaction followed by a ring opening of the azlactone moiety is presented. The products are isolated as single regioisomers in good overall yields and high enantioselectivities (up to 95 % ee). The possibility for easy modifications of the obtained products was
膦一锅法:提出了通过膦催化的[3+2]环加成反应,然后二氢唑酮部分开环,从二氢唑酮和丙二烯一锅法合成环状α-氨基酯。产物以单一区域异构体的形式分离出来,具有良好的总产率和高对映选择性(高达 95% ee)。通过合成氨基酸和α-羟基-β-酮酯证明了对所得产品进行简单修饰的可能性。