Dimethylformamide dimethyl acetal → HCID 54308355, compound

Participants

Reaction Steps

To a solution of the product of step (i) (10 g) in dry DMF (80 ml) was added dimethylformamide dimethyl acetal (DMFDMA) (30 ml) and the reaction mixture was heated to reflux. After 2 days a further quantity of DMFDMA (30 ml) was added and refluxing was continued for a further 2 days. The reaction mixture was evaporated and the residue partitioned between aqueous ammonium chloride solution and ethyl acetate. The organic layer was separated, washed with brine, dried (MgSO4) and evaporated. The residue was purified by flash chromatography on silica by elution with ethyl acetate to yield 1-ethoxycarbonyl-4-(1-dimethylamino-2-methoxycarbonylethen-2-yl)-piperazine (7 g) as an orange oil: NMR (CDCl3) δ 1.28 (3H, t), 2.90 (4H, m), 3.14 (6H, s), 3.50 (4H, m), 3.64 (3H, s), 4.12 (2H, q), 7.01 (1H, s); m/Z 286 (M+H)+.

Provenance & Evidence