Hydrochloric Acid → HCID 70076743, compound

Participants

Reaction Steps

A mixture of the product of step (ii) (6.3 g), m-anisidine (2.5 ml), ethanol (65 ml) and concentrated hydrochloric acid (2.2 ml) was stirred at room temperature for 2 hours then evaporated. The residue was basified by careful addition of aqueous sodium carbonate solution. The mixture was extracted with ethyl acetate and the organic extracts were washed with brine, dried (MgSO4) and evaporated to dryness. The residue was purified by flash chromatography on silica by elution with 70% v/v ether/hexane to yield 1-ethoxycarbonyl-4-(1-(3-methoxyphenyl)amino-2-methoxycarbonylethen-2-yl)piperazine (5.15 g) as an off-white solid: m.p. 120°-122° C.; NMR (CDCl3) δ 1.28 (3H, t), 2.90 (4H, m), 3.50 (4H, m), 3.71 (3H, s), 3.81 (3H, s), 4.18 (2H, q), 6.52 (3H, m), 7.21 (1H, t), 7.39 (1H, d), 7.80 (1H, d); m/Z 364 (H+H)+.

Provenance & Evidence