Sodium Hydroxide → 3-Hydroxy-5-methyl-1,6-naphthyridin-2(1H)-one

HRID 1649167Notes

Reaction equation

HRID 1649167 reaction equation
N[C:2]1[C:3](=[O:13])[NH:4][C:5]2[C:10]([CH:11]=1)=[C:9]([CH3:12])[N:8]=[CH:7][CH:6]=2.[OH-:14].[Na+]>C(O)(=O)C>[OH:14][C:2]1[C:3](=[O:13])[NH:4][C:5]2[C:10]([CH:11]=1)=[C:9]([CH3:12])[N:8]=[CH:7][CH:6]=2

Participants

4

Reactant 2

HCID 14798Sodium HydroxideHCID 132320483-Amino-5-methyl-1,6-naphthyridin-2(1H)-one

Product 1

HCID 132320493-Hydroxy-5-methyl-1,6-naphthyridin-2(1H)-one

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

This compound was prepared by heating 3-amino-5-methyl-1,6-naphthyridin-2(1H)-one following in part the procedure described in Example E-4 without purification of 3-amino-5-methyl-1,6-naphthyridin-2(1H)-one by reacting said unpurified 3-amino compound with aqueous sodium hydroxide solution or by similarly reacting said purified 3-amino compound with aqueous sodium hydroxide solution. These procedures are described as follows. Following the procedure described in Example E-4 using 27 g of 1,2-dihydro-5-methyl-2-oxo-1,6-naphthyridine-3-carboxylic acid hydrazide, 60 ml of concentrated sulfuric acid, 200 ml of water and 9.1 g of sodium nitrite and after concentrating the reaction mixture to dryness on a rotary evaporator, the residue containing the corresponding said 3-amino compound was treated with 75 ml of 35% sodium hydroxide solution and 100 ml of water and the resulting aqueous mixture was heated on a steam bath for 30 hours and then acidified with acetic acid. The acidified mixture was allowed to stand at room temperature overnight and the resulting product that separated was collected, washed with water and air-dried. It was then recrystallized from 400 ml of boiling dimethylformamide, filtering off the insoluble material, concentrating the filtrate to a volume of about 200 ml and then allowing it to stand at room temperature for 3 hours. The yellow crystalline solid was collected, washed with methanol and dried at 100° C. to yield 7.6 g of 3-hydroxy-5-methyl-1,6-naphthyridin-2-(1H)-one, m.p. >320° C. The same compound was also prepared by heating a mixture containing 3-amino-5-methyl-1,6-naphthyridin-2(1H)-one with 25 ml of 10% aqueous sodium hydroxide solution on a steam bath for 7 hours and then cooled to room temperature. The reaction mixture was acidified with acetic acid and the resulting white crystalline precipitate was collected, washed with water and dried at 95° C. to yield 1.2 g of 3-hydroxy-5-methyl-1,6-naphthyridin-2(1H)-one, m.p. >320° C.

Workup

  1. customThe same compound was also prepared
  2. temperatureby heating a mixture
  3. customthe resulting white crystalline precipitate was collected
  4. washwashed with water
  5. customdried at 95° C.

Sources & evidence

ORD record
ord-14738c4d738b458fab93f9924274fa08
Source dataset
uspto-grants-1983_11
Patent number
US04415580

Reaction notes

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