Table 2. Substrate Scope of Benzoylmethylene malonates^a,b.

^aReaction conditions: 1a (1.0 mmol), 2a (0.11 mmol), 3 (0.1 mmol), 4 Å MS (10 mg), DCM (1 mL) at 65 ^οC for 24 h.

^bIsolated yields.