Brønsted Acid Catalyzed Dynamic Kinetic Resolution of Azlactones for the Synthesis of Aryl Glycine Derivatives
作者:Liu-Zhu Gong、Chao Wang、Hong-Wen Luo
DOI:10.1055/s-0030-1259711
日期:2011.4
The dynamic kinetic resolution of C4-aryl azlactones with alcohols was investigated by employing Brønsted acid catalysis. The reaction provided an efficient complementary approach to access chiral aryl glycine derivatives with excellent yields (up to 99%) and enantioselectivities (up to 96% ee).
Dynamic Kinetic Resolution of Azlactones by Bifunctional Thioureas with α‑Trifluoromethyl or Methyl Groups
作者:Marcos Hernández-Rodríguez、Eddy I. Jiménez、Margarita Cantú-Reyes、Miguel Flores-Ramos、Carlos A. Román-Chavarría、Howard Díaz-Salazar
DOI:10.1055/a-1892-9911
日期:2022.10
The asymmetric ring opening of azlactones via dynamickineticresolution (DKR) is investigated by contrasting thioureas incorporating 1-arylethyl substituents against their more acidic trifluoromethylated analogs. All the catalysts under study outperform Takemoto’s thiourea because of the inclusion of an additional chiral center. However, the difference in yield and selectivity between the fluorinated