Water → 1-(4-Methoxy-phenyl)-7a-morpholin-4-yl-7-oxo-3a,4,5,6,7,7a-hexahydro-1H-pyrazolo[3,4-c]pyridin-3-carboxylic acid ethyl ester

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A solution of chloro[(4-methoxyphenyl)hydrazono]acetic acid ethyl ester (34, 582 mg, 2.0 mmol) in ethyl acetate (EtOAc, 10 mL) was treated with 3-morpholin-4-yl-5,6-dihydro-1H-pyridin-2-one (45, 364 mg, 2.0 mmol, 1.0 equiv) at 0–5° C. under N2, and the resulting reaction mixture was treated with triethylamine (TEA, 505 mg, 0.70 mL, 5.0 mmol, 2.5 equiv) at 0–5° C. under N2. The reaction mixture was then warmed up to room temperature for 30 min before being warmed up to reflux for an additional 6 h. When HPLC and TLC showed that the reaction was complete, the reaction mixture was treated with water (10 mL) and EtOAc (10 mL). The two layers were separated, and the aqueous layer was extracted with EtOAc (3×10 mL). The combined organic extracts were washed with saturated NaCl aqueous solution (5 mL), dried over MgSO4, and concentrated in vacuo. The residue was directly purified by flash column chromatography (SiO2, 15–40% EtOAc/hexane gradient elution) to afford the desired 1-(4-methoxy-phenyl)-7a-morpholin-4-yl-7-oxo-3a,4,5,6,7,7a-hexahydro-1H-pyrazolo[3,4-c]pyridin-3-carboxylic acid ethyl ester (51, 523 mg, 805 mg theoretical, 65%) as pale-yellow oil, which solidified upon standing at room temperature in vacuo. For 51, CIMS m/z 401 (M+−H, C20H26N4O5).

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