Water → Ethyl 8-(3,3-dimethylpiperidin-1-yl)-9-fluoro-4-methyl-1-oxo-1,4-dihydrobenzo[f][1,7]naphthyridine-2-carboxylate

HRID 413052Notes

Reaction equation

HRID 413052 reaction equation
F[C:2]1[C:22]([F:23])=[CH:21][C:5]2[C:6]3[C:7](=[O:20])[C:8]([C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:9][N:10]([CH3:14])[C:11]=3[CH:12]=[N:13][C:4]=2[CH:3]=1.[CH3:24][C:25]1([CH3:31])[CH2:30][CH2:29][CH2:28][NH:27][CH2:26]1.O>CS(C)=O>[CH3:24][C:25]1([CH3:31])[CH2:30][CH2:29][CH2:28][N:27]([C:2]2[C:22]([F:23])=[CH:21][C:5]3[C:6]4[C:7](=[O:20])[C:8]([C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:9][N:10]([CH3:14])[C:11]=4[CH:12]=[N:13][C:4]=3[CH:3]=2)[CH2:26]1

Participants

5

Reactant 3

HCID 962WaterHCID 709423,3-DimethylpiperidineHCID 18523355Ethyl 8,9-difluoro-4-methyl-1-oxo-1,4-dihydrobenzo[f][1,7]naphthyridine-2-carboxylate

Product 1

HCID 18523238Ethyl 8-(3,3-dimethylpiperidin-1-yl)-9-fluoro-4-methyl-1-oxo-1,4-dihydrobenzo[f][1,7]naphthyridine-2-carboxylate

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Conditions

Temperature
80 °C

Procedure

A suspension of 2 g of ethyl 8,9-difluoro-4-methyl-1-oxo-1,4-dihydrobenzo[f][1,7]naphthyridine-2-carboxylate and 3.23 cm3 of 3,3-dimethylpiperidine in 40 cm3 of dimethyl sulphoxide was heated at a temperature in the region of 80° C. for 72 hours. After cooling to about 200° C., 200 cm3 of water was added to the reaction mixture. The precipitate obtained was dewatered and washed with 25 cm3 of water. The solid was taken up in 100 cm3 of dichloromethane, the residual water was decanted off; the organic solution was dried over magnesium sulphate and concentrated under reduced pressure (5 kPa) at about 40° C. 2.67 g of a mixture containing ethyl 9-(3,3-dimethylpiperidin-1-yl)-8-fluoro-4-methyl-1-oxo-1,4-dihydrobenzo[f][1,7]naphthyridine-2-carboxylate and ethyl 8-(3,3-dimethylpiperidin-1-yl)-9-fluoro-4-methyl-1-oxo-1,4-dihydrobenzo[f][1,7]naphthyridine-2-carboxylate was obtained. This mixture was purified by flash chromatography on silica gel (particle size 20-45 μm, diameter 10 cm, height 60 cm) at a pressure of 80 kPa, eluted with a mixture containing 99% dichloromethane and 1% methanol, and 70 cm3 fractions were collected. After concentration of fractions 16 to 39 under reduced pressure (5 kPa) at about 50° C., 0.85 g of ethyl 9-(3,3-dimethylpiperidin-1-yl)-8-fluoro-4-methyl-1-oxo-1,4-dihydrobenzo[f][1,7]naphthyridine-2-carboxylate was obtained in the form of a yellow solid, which melted at around 218-220° C.

Workup

  1. temperatureAfter cooling to about 200° C.
  2. customThe precipitate obtained
  3. washwashed with 25 cm3 of water
  4. customthe residual water was decanted off
  5. dry with materialthe organic solution was dried over magnesium sulphate
  6. concentrationconcentrated under reduced pressure (5 kPa) at about 40° C
  7. addition2.67 g of a mixture containing ethyl 9-(3,3-dimethylpiperidin-1-yl)-8-fluoro-4-methyl-1-oxo-1,4-dihydrobenzo[f][1,7]naphthyridine-2-carboxylate

Sources & evidence

ORD record
ord-b4b1da10fcf748c68ca4eef099f5727b
Source dataset
uspto-grants-2003_05
Patent number
US06566362B2

Reaction notes

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