Water → HCID 178436949, compound

Participants

Reaction Steps

Formamidine acetate (500 g) and methyl 3-oxopentanoate (500 g) were added to a solution of sodium methoxide (500 g) in methanol (4 L) at 20° C. and the mixture stirred for 15 hours. Water (lL) and acetic acid (500 ml) were added to give a pH of 7. The solvent was removed by evaporation under reduced pressure and the aqueous residue was diluted with water (1 L) and extracted with methyl ethyl ketone (4×2.5 L). The organic phases were combined and concentrated by evaporation under reduced pressure to give an orange syrup. The syrup was dissolved in ethyl acetate (1 L) and the solution stirred for 15 hours to give a solid. The solid was collected by filtration, washed with ethyl acetate (200 ml, at 10° C.) and dried at 50° C. under reduced pressure to provide the title compound (183 g). After concentrating the mother liquors under reduced pressure, diethyl ether (3 L) was added to provide a solid. This was solid was collected by filtration, washed with tert-butyl methyl ether (200 ml) and dried at 50° C. under reduced pressure to provide a second crop of the title compound (195 g). The total yield of the title compound was approximately 79%.

Provenance & Evidence