2,2-Dimethyl-1,3-dioxane-4,6-dione → 5-(Benzo[b]thiophen-2-ylmethyl)-2,2-dimethyl-1,3-dioxane-4,6-dione

Participants

Reaction Steps

Proline (0.695 g, 5.98 mmol) was added to a solution of benzo[b]thiophene-2-carbaldehyde (5.00 g, 29.9 mmol) and Meldrum's acid (4.31 g, 29.9 mmol) in EtOH (50 mL). The mixture was stirred at room temperature for 1 hour and diethyl 1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxylate (7.57 g, 29.9 mmol) was added. Stirring was continued for 5 hours at room temperature and the precipitated product isolated by filtration rinsing further with iPrOH and dried under reduced pressure to provide the title compound as a white solid.

Provenance & Evidence