1-(2-Hydroxyethyl)piperazine → 1-Cyclopropyl-7-fluoro-8-[4-(2-hydroxyethyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid

HRID 1073619Notes

Reaction equation

HRID 1073619 reaction equation
Cl[C:2]1[C:3]([F:23])=[CH:4][C:5]2[C:6]([CH:22]=1)=[N:7][C:8]1[N:9]([CH:19]3[CH2:21][CH2:20]3)[CH:10]=[C:11]([C:16]([OH:18])=[O:17])[C:12](=[O:15])[C:13]=1[CH:14]=2.[OH:24][CH2:25][CH2:26][N:27]1[CH2:32][CH2:31][NH:30][CH2:29][CH2:28]1>N1C=CC=CC=1>[CH:19]1([N:9]2[C:8]3[N:7]=[C:6]4[CH:22]=[C:2]([N:30]5[CH2:31][CH2:32][N:27]([CH2:26][CH2:25][OH:24])[CH2:28][CH2:29]5)[C:3]([F:23])=[CH:4][C:5]4=[CH:14][C:13]=3[C:12](=[O:15])[C:11]([C:16]([OH:18])=[O:17])=[CH:10]2)[CH2:21][CH2:20]1

Participants

4

Reactant 2

HCID 76771-(2-Hydroxyethyl)piperazineHCID 147005568-Chloro-1-cyclopropyl-7-fluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid

Product 1

HCID 147005771-Cyclopropyl-7-fluoro-8-[4-(2-hydroxyethyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acidYield 18.3%

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

The reaction is carried out under conditions analogous to Reference Example 5 but starting from 4 g of 8-chloro-1-cyclopropyl-7-fluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid and 6.2 g of 1-(2-hydroxyethyl)-piperazine in 40 cm3 of pyridine The reaction mixture is heated for 22 hours at a temperature close to 115° C. The pure product is isolated after recrystallizing 3 times from 3 times 200 cm3 of ethanol containing 10% of dimethylformamide each time. 0.94 g of 1-cyclopropyl-7-fluoro-8-[4-(2-hydroxyethyl)-1-piperazinyl]-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid is obtained in the form of a yellow solid melting at 255° C.

Workup

  1. temperatureis heated for 22 hours at a temperature
  2. customclose to 115° C
  3. customThe pure product is isolated
  4. customafter recrystallizing 3 times from 3 times 200 cm3 of ethanol containing 10% of dimethylformamide each time

Sources & evidence

ORD record
ord-38d78c1a414349ceaab1710c2673791e
Source dataset
uspto-grants-1990_11
Patent number
US04970213

Reaction notes

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