[摘要]:The asym. Michael addn. of arom. heterocyclic aldehydes to arylidenemalonates catalyzed by N-heterocyclic carbenes is described. The keto malonates are obtained in 84-98% yields and moderate to good enantioselectivities (30-78% ee). The enantiomeric excesses could be improved to excellent levels of ?9% ee after a single recrystn.