Reacción #4878

Ecuación de reacción

methanesulfonylchloride

1-methyl-3-pyrrolidinol

triethylamine

sodium

1-hydroxy-2-naphthalenecarboxamide

→

1-[(1-Methyl-3-pyrrolidinyl)oxy]-2-naphthalene carboxamide

Disolventes

water

benzene

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturawhile cooling with an ice bath
2. 2
   Filtraciónfiltered
3. 3
   LavadoThe filter cake was washed with 500 ml of benzene
4. 4
   Concentraciónconcentrated on the rotary evaporator to about 200 ml
5. 5
   workup.ADDITIONThe residue was added dropwise to the
6. 6
   Otroabove prepared dimethylsulfoxide solution
7. 7
   workup.STIRRINGwhile stirring at 75° C
8. 8
   TemperaturaThe resulting solution was cooled
9. 9
   ExtracciónThe mixture was extracted with three portions of chloroform
10. 10
    Concentraciónconcentrated
11. 11
    OtroThe residue was partitioned between ethyl acetate and dilute hydrochloric acid
12. 12
    Extracciónextracted twice with ethyl acetate
13. 13
    Secadodried over sodium sulfate
14. 14
    Concentraciónconcentrated
15. 15
    OtroThe residue was crystallized from ethyl acetate-isooctane
16. 16
    OtroA portion was recrystallized twice from ethyl acetate-isooctane, m.p. 122°-129° C.

Procedimiento

In another vessel, 79 g (0.69 mole) of methanesulfonylchloride was added dropwise to a solution of 69.7 g (0.69 mole) of 1-methyl-3-pyrrolidinol and 77 g (0.76 mole) of triethylamine in 500 ml of dry benzene while cooling with an ice bath. The mixture was stirred 15 minutes and filtered. The filter cake was washed with 500 ml of benzene and the benzene filtrates were combined and concentrated on the rotary evaporator to about 200 ml. The residue was added dropwise to the above prepared dimethylsulfoxide solution containing the sodium salt of 1-hydroxy-2-naphthalenecarboxamide while stirring at 75° C. The temperature was maintained at 75° C. for 18 hr with external heat. The resulting solution was cooled and an equal volume of water was added. The mixture was extracted with three portions of chloroform. The washes were combined and concentrated. The residue was partitioned between ethyl acetate and dilute hydrochloric acid. The acid layer was made basic with sodium hydroxide and extracted twice with ethyl acetate. The ethyl acetate washes were combined, dried over sodium sulfate and concentrated. The residue was crystallized from ethyl acetate-isooctane. Yield of solid was 55 g (32%). A portion was recrystallized twice from ethyl acetate-isooctane, m.p. 122°-129° C.

Fuente