357933-30-3Relevant articles and documents
Kinetic Resolution and Dynamic Kinetic Resolution of γ-Aryl-Substituted Butenolides via Copper-Catalyzed 1,4-Hydroboration
Lee, Soyeon,Ryu, Do Hyun,Yun, Jaesook
supporting information, p. 2377 - 2381 (2021/01/04)
Kinetic resolution (KR) and dynamic kinetic resolution (DKR) of γ-aryl and heteroaryl-substituted butenolides via CuH-catalyzed 1,4-hydroboration using pinacolborane is reported. With a copper-Ph-BPE catalyst, selectivity factors were extremely high (s=>400) with regard to the kinetic resolution of β-methyl-γ-phenyl butenolide; DKR was possible in the presence of an amine base (DBU), which facilitated racemization of the starting unsaturated lactones. The reaction provided easy access to highly enantioenriched γ-butyrolactones (>99% ee) containing β,γ-substituents. (Figure presented.).