Phosphorus oxychloride → HCID 86740692, compound

HRID 483079Notes

Reaction equation

HRID 483079 reaction equation
O[C:2]1[C:3]2[CH2:17][C:16]3[CH:18]=[CH:19][CH:20]=[CH:21][C:15]=3[O:14][C:4]=2[N:5]=[C:6]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[N:7]=1.P(Cl)(Cl)(Cl)(Cl)[Cl:23].P(Cl)(Cl)(Cl)=O>>[Cl:23][C:2]1[C:3]2[CH2:17][C:16]3[CH:18]=[CH:19][CH:20]=[CH:21][C:15]=3[O:14][C:4]=2[N:5]=[C:6]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[N:7]=1

Participants

4

Reactant 3

HCID 24813Phosphorus oxychlorideHCID 24819Phosphorus pentachlorideHCID 178517454HCID 178517454, compound

Product 1

HCID 86740692HCID 86740692, compound

Procedure

Eight and one tenth (8.1) gram 4-hydroxy-2-phenyl[1]benzopyrano[2,3-d]pyrimidine, 9.0 g phosphoruspentachloride and 36 ml phosphorusoxychloride are heated for two hours under reflux. Excess phosphorusoxychloride is then distilled off under a vacuum and the residue is partitioned to chloroform and water, a pH 6 value being adjusted by the addition of 10% sodium hydroxide. The organic phase is separated and the chloroform removed by distillation in a rotary evaporator. The residue obtained is separated by chromatography using cyclohexane/chloroform 1:1 as an eluting agent. There are obtained 4.0 g 4-chloro-2-phenyl[1]benzopyrano[2,3-d]pyrimidine, mp 168°-170° C. as colorless crystals. Thereafter 0.05 g sodium are dissolved in 10 ml anhydrous ethanol and 0.25 g 3-dimethylamino-1-propane-thiol added to the solution. The mixture obtained is added dropwise to a solution of 0.6 g 4-chloro-2-phenyl[1]benzopyrano[2,3-d]pyrimidine at reflux temperature. The reaction mixture is then kept under reflux for another two hours. After cooling the reaction mixture is filtered and the filtrate is evaporated to dryness and the residue partitioned to chloroform and water. The organic phase is separated off, the chloroform is evaporated and the residue recrystallized from ethanol. There are obtained 0.4 g colorless crystals, mp 93° C.

Workup

  1. temperatureunder reflux
  2. distillationExcess phosphorusoxychloride is then distilled off under a vacuum
  3. customthe residue is partitioned to chloroform and water
  4. additiona pH 6 value being adjusted by the addition of 10% sodium hydroxide
  5. customThe organic phase is separated
  6. customthe chloroform removed by distillation in a rotary evaporator
  7. customThe residue obtained
  8. customis separated by chromatography

Sources & evidence

ORD record
ord-d00352fb65f244a88291b9a40ef290b6
Source dataset
uspto-grants-1986_03
Patent number
US04578380

Reaction notes

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