Piperidine → 6-[4-(2,3-epoxypropoxy)-1-naphthyl]-4,5-dihydro-3(2H)-pyridazinone

HRID 596676Notes

Reaction equation

HRID 596676 reaction equation
[OH:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([C:12]2[CH2:13][CH2:14][C:15](=[O:18])[NH:16][N:17]=2)=[CH:4][CH:3]=1.O[C:20]1C=CC=C[C:21]=1[C:22](CCC(O)=O)=[O:23].N1CCCCC1.[OH-].[Na+]>ClCCl>[O:23]1[CH2:22][CH:21]1[CH2:20][O:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([C:12]2[CH2:13][CH2:14][C:15](=[O:18])[NH:16][N:17]=2)=[CH:4][CH:3]=1

Participants

6

Reactant 4

HCID 8082PiperidineHCID 14798Sodium HydroxideHCID 30160863-(2-Hydroxybenzoyl)propionic acidHCID 135573282HCID 135573282, compound

Product 1

HCID 214502226-[4-(2,3-epoxypropoxy)-1-naphthyl]-4,5-dihydro-3(2H)-pyridazinoneYield 71.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of 6-(4-hydroxy-1-naphthyl)-4,5-dihydro-3(2H)-pyridazinone (0.5 g, 0.002 mole), epichlorohydrin (2g, 0.02 mole), and piperidine (0.02 g) was heated on a steam bath for 1.5 hours. Evaporation under reduced pressure gave an oil which was dissolved in dichloromethane and shaken with dilute sodium hydroxide (5 ml). The organic phase was washed with water, dried and evaporated to an oil which with ethanol-ether gave crystalline 6[4-(2,3-epoxy-propoxy)-1-naphthyl]-4,5-dihydro-3(2H)-pyridazinone (0.425 g, 69%, m.p. 151°-155° C). Crystallisation from ethanol gave the pure epoxide, m.p. 153.5°-155.5° C.

Workup

  1. temperaturewas heated on a steam bath for 1.5 hours
  2. customEvaporation under reduced pressure
  3. customgave an oil which
  4. washThe organic phase was washed with water
  5. customdried
  6. customevaporated to an oil which with ethanol-ether

Sources & evidence

ORD record
ord-dc8ef4cdc4ea4190b40e12dd39427268
Source dataset
uspto-grants-1977_03
Patent number
US04011321

Reaction notes

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