Реакция #72544

Уравнение реакции

HCl

ethyl(methylsulphanyl)acetate

ethyl 4-amino-benzoate

tBuOCl

→

title product

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

Растворители

ether

triethylamine

DCM

Условия реакции

Обработка

1. 1
   Температураmaintaining the temperature between −60° C. and −55° C
2. 2
   Другоеis brought to 0° C.
3. 3
   workup.STIRRINGAfter stirring for 12 hours at ambient temperature
4. 4
   Другоеthe phases are separated
5. 5
   Промывкаthe organic phase is washed successively with aq. 2M HCl solution, water
6. 6
   СушкаThe organic phase is dried over sodium sulphate
7. 7
   Фильтрацияfiltered
8. 8
   Другоеevaporated to dryness
9. 9
   ДругоеThe residue obtained
10. 10
    ДругоеThe crystals obtained
11. 11
    Фильтрацияare filtered off
12. 12
    Промывкаwashed with ether
13. 13
    Другоеdried in vacuo

Методика

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.

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