Water → HCID 178472215, compound

Participants

Reaction Steps

To a solution of ethyl-3-aminocrotonate (F-1) (64.6 g, 0.5 mol, 1.0 eq) and pyridine (44.5 mL, 0.55 mol, 1.1 eq) in THF (600 mL) at −20° C., 2-chloroacetyl chloride (59.3 g, 0.53 mol, 1.05 eq) is added dropwise within 1 h. The resulting mixture is stirred from −20° C. to RT for an additional 2 h and then it is poured into H2O (1200 mL). The mixture is extracted with ethyl acetate (3×1200 mL). The combined organic layer is washed with H2O (2×500 mL) and brine (500 mL), dried over anhydrous Na2SO4 and filtered. The filtrate is concentrated in vacuo to reduce the volume to about 200 mL. The residue is slurried in petroether (400 mL) at RT for 30 min. The solid is collected by filtration, rinsed with petroether (200 mL), and dried in vacuo to afford the product, (E)-ethyl 3-amino-2-(2-chloroacetyl)but-2-enoate (F-2).

Provenance & Evidence