Pentamethyldiethylenetriamine → HCID 58817684, compound

To a stirred solution of 2-fluoroanisole (6.00 g, 47.6 mmol) and anhydrous THF (125 mL) at −78° C. under nitrogen was added butyllithium (35 mL of a 1.6 M solution in hexanes, 56.0 mmol). After stirring for 13 min, N,N,N′,N′,N″-Pentamethyldiethylenetriamine (12.9 mL, 61.8 mmol) was added dropwise and the reaction stirred at −78° C. After 168 min, a solution of 4-(methoxy-methyl-carbamoyl)-piperidine-1-carboxylic acid tert-butyl ester (16.8 g, 61.7 mmol) in anhydrous THF (40 mL) was added dropwise over 25 min. The reaction was stirred at −78° C. for 35 min and at room temperature for 65 min. The reaction was diluted with ethyl acetate (400 mL) and washed with cold 0.5 N aqueous HCl (2×200 mL), 5% aqueous potassium carbonate (200 mL), water (200 mL), and brine (200 mL) successively. The organic phase was dried over magnesium sulfate, filtered, and the solvent removed to give 20.1 g of a yellow oil. The product was chromatographed on silica gel (350 g), using a step gradient elution of 20% ethyl acetate/heptane to 30% ethyl acetate/heptane, to afford 12.0 g (75%) of the desired product as a white solid.

1. stirringthe reaction stirred at −78° C
2. waitAfter 168 min
3. stirringThe reaction was stirred at −78° C. for 35 min and at room temperature for 65 min
4. washwashed with cold 0.5 N aqueous HCl (2×200 mL), 5% aqueous potassium carbonate (200 mL), water (200 mL), and brine (200 mL) successively
5. dry with materialThe organic phase was dried over magnesium sulfate
6. filtrationfiltered
7. customthe solvent removed

ORD record

ord-faafc1fb1ffe4ec0ab6daff08b79241f

Source dataset

uspto-grants-2009_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07521445B2