Reacción #1375806

Ecuación de reacción

intermediate 1-b

1,1-dimethylethyl [(4-chlorophenyl)(1 -methyl-1H-benzotriazol-6-yl)-methylene]hydrazine carboxylate

hydrochloric acid

water

→

(±)-6-[(4-chlorophenyl)hydrazinomethyl]-1-methyl-1H-benzotriazole monohydrochloride

Disolventes

tetrahydrofuran

tetrahydrofuran

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe whole was heated
2. 2
   Temperaturato reflux
3. 3
   Temperaturarefluxed for 1.5 hours
4. 4
   TemperaturaThe mixture was cooled to room temperature
5. 5
   workup.STIRRINGAfter stirring for 1 hour
6. 6
   Filtraciónthe reaction mixture was filtered
7. 7
   workup.ADDITIONThe filtrate was mixed with 75 ml of methylbenzene
8. 8
   OtroThe layers were separated
9. 9
   ExtracciónThe product was extracted with dichloromethane
10. 10
    Otrothe extract was dried
11. 11
    Filtraciónfiltered
12. 12
    Otroevaporated
13. 13
    workup.ADDITIONby adding 3ml of a mixture of hydrochloric acid in 2-propanol (4.8N)
14. 14
    workup.STIRRINGAfter stirring for 2 hours the product
15. 15
    Filtraciónwas filtered off
16. 16
    Lavadowashed with 2-propanol
17. 17
    Otrodried in vacuo at 50° C.

Procedimiento

To a suspension of 10 g of intermediate 1-b in 60 ml of tetrahydrofuran under a nitrogen atmosphere were added dropwise over 15 minutes 26 ml of a borane tetrahydrofuran complex in tetrahydrofuran (1M). After stirring for 15 minutes at ±22° C. there were added 13 ml of hydrochloric acid (6N). The whole was heated to reflux and refluxed for 1.5 hours. The mixture was cooled to room temperature and 50 ml of water were added. After stirring for 1 hour, the reaction mixture was filtered. The filtrate was mixed with 75 ml of methylbenzene. The layers were separated and the aqueous layer was basified (pH 7.5-8) with NH4OH. The product was extracted with dichloromethane and the extract was dried, filtered and evaporated. The residue was converted into the hydrochloride salt in 2-propanol by adding 3ml of a mixture of hydrochloric acid in 2-propanol (4.8N). After stirring for 2 hours the product was filtered off, washed with 2-propanol and dried in vacuo at 50° C., yielding 2.1 g of (±)-6-[(4-chlorophenyl)hydrazinomethyl]-1-methyl-1H-benzotriazole monohydrochloride (interm. 2-e).

Fuente