Water → methyl 3-[5-(dimethylcarbamoyl)pyrazin-2-yl]oxy-5-[(2S)-1-hydroxypropan-2-yl]oxy-benzoate

Participants

Reaction Steps

A solution of methyl 3-[5-(dimethylcarbamoyl)pyrazin-2-yl]oxy-5-[(2S)-1-[(2-methylpropan-2-yl)oxy]propan-2-yl]oxy-benzoate (170 g, 0.39 mol) in formic acid (850 mL) was heated to 90° C. for 3 hours. Ethyl acetate (1700 mL), water (1700 mL) and saturated aqueous brine (850 mL) was added and the aqueous layer separated and extracted with ethyl acetate (850 mL) and the combined organic layers were washed with saturated aqueous brine (850 mL), dried (MgSO4) and evaporated under reduced pressure. The residue was dissolved with ethyl acetate (1500 mL), water (1500 mL) and methanol (150 mL). Sodium carbonate (170 g) was added and the biphasic solution heated to reflux for 2 hours. The aqueous layer was separated and the organic layer washed with water (1700 mL). The combined aqueous phases were extracted with ethyl acetate (850 mL) and the combined organic layers dried (MgSO4) and evaporated under reduced pressure. The residue was purified by flash chromatography eluting with 100% ethyl acetate to obtain a the title compound (148 g).

Provenance & Evidence