Application
1-[3,5-Bis(trifluoromethyl)phenyl]-3-[(1S,2S)-(+)-2-(dimethylamino)cyclohexyl]thiourea, commonly known as S,S-TUC, serves as a versatile catalyst with a broad range of applications in asymmetric synthesis. It is prominently used in the enantio- and diastereoselective Michael addition of malonates and ketoesters to nitroolefins, showcasing excellent selectivity and efficiency. Additionally, S,S-TUC facilitates the enantioselective hydrazination of 1,3-dicarbonyl compounds, enabling the production of chiral derivatives with high precision. Its capabilities extend to the dynamic resolution of azalactones, ensuring the attainment of pure enantiomers. In complex transformation reactions, S,S-TUC proves effective in the Michael-Aldol reaction involving 2-mercaptobenzaldehyde and α,β-unsaturated oxazolidinones. Furthermore, it is instrumental in the enantioselective synthesis of flavanones and chromanones, offering significant advantages for pharmaceutical and natural product synthesis. The catalyst also plays a critical role in the asymmetric Neber reaction and supports the three-component synthesis of 2,6-diazabicyclo[2.2.2]octanones, demonstrating its indispensable utility in advanced synthetic methodologies.