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This thesis focuses on desymmetrization reactions enabled by N-heterocyclic carbenes (NHCs) organocatalysts. An enantiomerically enriched spirocylic skeletons construction reaction that realized by NHC-thiourea cooperative strategy is first discussed. Second part is about NHC organocatalytic strategy for the enantioselective formal [4+2] construction of multisubstituted phenols, which represents the first intermolecular cycloaddtion arene construction method. The last part describes an enantioselective approach to conformationally constrained carbocyclic β-amino acids via aminecatalyzed addition of unsaturated imine gamma-carbon to enal. ZHUO SHITIAN

N-hetereocyclic carbenes-catalyzed desymmetrization and rapid access to spirocylic molecules