Diisopropylethylamine → 6-(Benzene sulfonyl amino-methyl)-3-benzyloxy-1-methyl-4-oxo-1,4-dihydro-pyridine-2-carboxylic acid methyl amide

To a stirred solution of 6-(benzene sulfonyl amino-methyl)-3-benzyloxy-1-methyl-4-oxo-1,4-dihydro-pyridine-2-carboxylic acid (13-01) (400.0 mg, 0.935 mmol) in dimethylformamide (10 mL) were added HATU (O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate) (426.17 mg, 1.12 mmol) and diisopropylethylamine (1.08 mL, 6.54 mmol). The mixture was stirred for 30 min., thenmethylamine hydrochloride salt (189.31 mg, 2.80 mmol) was added and the reaction mixture was stirred at room temperature for 16 h. After completion of the reaction, it was quenched with ice cold water and the reaction mixture was extracted with ethyl acetate. The combined organic layer was washed with water and brine, dried over Na2SO4 and concentrated under reduced pressure. It was then purified using normal column chromatography to get 6-(benzene sulfonyl amino-methyl)-3-benzyloxy-1-methyl-4-oxo-1,4-dihydro-pyridine-2-carboxylic acid methyl amide (15-01) (180.0 mg, 43.62%) as a white solid.

1. stirringthe reaction mixture was stirred at room temperature for 16 h
2. customAfter completion of the reaction, it
3. customwas quenched with ice cold water
4. extractionthe reaction mixture was extracted with ethyl acetate
5. washThe combined organic layer was washed with water and brine
6. dry with materialdried over Na2SO4
7. concentrationconcentrated under reduced pressure
8. customIt was then purified

ORD record

ord-ce2cd700356342899677055e0481c20f

Source dataset

uspto-grants-2015_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08952039B2