Réaction #4896

Équation de réaction

Hydrogen chloride

sodium 2-[(1-methyl-3-pyrrolidinyl)oxy]-3-pyridinecarboxylate

triphenylphosphine

carbon tetrachloride

→

2-(2-Chloroethyl)-2,3-dihydro-4-methylpyrido[3,2-f][1,4]-oxazepin-5(4H)-one hydrochloride

Solvants

chloroform

ethanol

Conditions de réaction

Traitement

1. 1
   Températureat reflux for 1.5 hr
2. 2
   Autrethe heat removed
3. 3
   workup.STIRRINGThe solution was stirred for 1 hour
4. 4
   Températurewhile cooling
5. 5
   workup.ADDITION200 ml of isooctane was added
6. 6
   ExtractionThe solution was extracted 4 times with a total of 800 ml of dilute hydrochloric acid
7. 7
   Extractionextracted with chloroform
8. 8
   AutreThe chloroform layer was separated
9. 9
   Séchagedried over sodium sulfate
10. 10
    Concentrationconcentrated
11. 11
    workup.DISSOLUTIONThe residue was dissolved in a mixture of 500 ml each of isopropyl alcohol and isopropyl ether
12. 12
    AutreA portion was recrystallized from isopropyl alcohol, m.p. 149°-153° C.

Mode opératoire

Hydrogen chloride gas was bubbled into a suspension of 150 g (0.61 mole) of sodium 2-[(1-methyl-3-pyrrolidinyl)oxy]-3-pyridinecarboxylate in 1 liter of chloroform until a pH of 6 was reached. To the stirred mixture was added 350 g (1.34 mole) of triphenylphosphine and 350 g (2.3 mole) of carbon tetrachloride and the resulting cloudy solution was stirred at reflux for 1.5 hr. About 100 ml of ethanol was added and the heat removed. The solution was stirred for 1 hour while cooling and 200 ml of isooctane was added. The solution was extracted 4 times with a total of 800 ml of dilute hydrochloric acid. The acid extracts were combined, made basic with sodium hydroxide and extracted with chloroform. The chloroform layer was separated and dried over sodium sulfate and concentrated. The residue was dissolved in a mixture of 500 ml each of isopropyl alcohol and isopropyl ether and acidified with ethereal hydrogen chloride. The resulting crystals weighed 82 g (49%). A portion was recrystallized from isopropyl alcohol, m.p. 149°-153° C.

Source