Cycloaddition of Aziridine with CO2/CS2 Catalyzed by Amidato Divalent Lanthanide Complexes

This is the first time that the amidato lanthanide amides ({L(n)Ln[N(SiMe3)(2)]THF}(2) (n = 1, Ln = Eu (1); n = 2, Ln = Eu (3), Yb (4); HL1 = (BuC6H4CONHC6H3)-Bu-t(Pr-i)(2); HL2 = C6H5CONHC6H3(Pr-i)(2)) and {(LEu)-Eu-3[N(SiMe3)(2)]THF}-(L2Eu)-Eu-3(THF)(2)} (2) (HL3 = ClC6H4CONHC6H3(Pr-i)(2))) were applied in the cycloaddition reactions of aziridines with carbon dioxide (CO2) or carbon disulfide (CS2) under mild conditions. The corresponding oxazolidinones and thiazolidine-2-thiones were obtained in good to excellent yields with good functional group tolerance.