Diisopropylethylamine → 3-isopropoxy-N-(1-methyl-piperidin-4-yl)-4-nitro-benzamide

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Reaction Steps

To a mixture of 0.88 g (3.9 mmole) of 3-isopropoxy-4-nitro-benzoic acid, 2.8 mL (16 mmole) of ethyldiisopropyl amine, 0.54 g (4.7 mmole) of 4-amino-1-methyl-piperidine and 18 mL of dimethylformamide was added 1.63 g (4.3 mmole) of 1-[bis(dimethylamino)methylene)-1H-benzotriazolium 3-oxide hexafluorophosphate. The mixture was stirred at room temperature for 2 hours, then diluted with ice water and saturated sodium carbonate. The mixture was extracted with ethyl acetate 3 times. The combined organic layers were washed three times with sodium carbonate, three times with brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. Purification by silica gel chromatography, eluting with dichloromethane-methanol (gradient, 100:0-40:60) gave 1.2 g of 3-isopropoxy-N-(1-methyl-piperidin-4-yl)-4-nitro-benzamide as a yellow solid.

Provenance & Evidence