Reacción #72544

Ecuación de reacción

HCl

ethyl(methylsulphanyl)acetate

ethyl 4-amino-benzoate

tBuOCl

→

title product

Ethyl 3-methylsulphanyl-2-oxo-2,3-dihydro-1H-indole-5-carboxylate

Disolventes

ether

triethylamine

DCM

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturamaintaining the temperature between −60° C. and −55° C
2. 2
   Otrois brought to 0° C.
3. 3
   workup.STIRRINGAfter stirring for 12 hours at ambient temperature
4. 4
   Otrothe phases are separated
5. 5
   Lavadothe organic phase is washed successively with aq. 2M HCl solution, water
6. 6
   SecadoThe organic phase is dried over sodium sulphate
7. 7
   Filtraciónfiltered
8. 8
   Otroevaporated to dryness
9. 9
   OtroThe residue obtained
10. 10
    OtroThe crystals obtained
11. 11
    Filtraciónare filtered off
12. 12
    Lavadowashed with ether
13. 13
    Otrodried in vacuo

Procedimiento

To a solution of ethyl 4-amino-benzoate (40.0 g) in DCM (900 ml) at −60° C. there is added, dropwise, ethyl(methylsulphanyl)acetate (34.5 ml) under a nitrogen atmosphere. 29.0 g of tBuOCl are then added, dropwise, to the reaction mixture over 25 minutes, maintaining the temperature between −60° C. and −55° C. After stirring for one hour at −50° C., triethylamine (15.4 ml) is added dropwise. The reaction mixture is brought to 0° C. and then aqueous 3M HCl solution (485 ml) is added dropwise. After stirring for 12 hours at ambient temperature, the phases are separated and the organic phase is washed successively with aq. 2M HCl solution, water and then sat. aqueous NaCl solution. The organic phase is dried over sodium sulphate, filtered and evaporated to dryness. The residue obtained is taken up in ether. The crystals obtained are filtered off, washed with ether and dried in vacuo to yield the title product, which is used directly in the next Step.

Fuente