Table 2. Optimization of reaction conditions for 1 with nBuLi and trapping the intermediate product with benzaldehyde.^a.

^aReaction conditions: 1 (1.0 mmol), n-BuLi (3.0 mmol) and benzaldehyde 4a (3.0 mmol) in 10 mL of THF at −78 ^oC under argon.

^bIsolated yield.