Reacción #75566

Ecuación de reacción

hydrogen sulfide

2-[2-(5-Bromo-2-methoxy-phenyl)-ethyl]-3-chloro-thiobenzimidic acid ethyl ester

HCl ether

→

orange powder

2-[2-(5-Bromo-2-methoxy-phenyl)-ethyl]-3-chloro-dithiobenzoic acid ethyl ester

Disolventes

water

tetrahydrofuran

Condiciones de reacción

Tratamiento posterior

1. 1
   Otrocondensed into
2. 2
   Extracciónextracted with methylene chloride once
3. 3
   LavadoThe organic layer was washed with brine
4. 4
   Secadodried (MgSO4)
5. 5
   Filtraciónfiltered
6. 6
   Otroevaporated
7. 7
   Otroto give a crude orange oil
8. 8
   OtroThe oil was partially purified by chromatography through a short column of silica gel (eluting with 5:95 ethyl acetate/hexanes) which

Procedimiento

As shown in Scheme 11, hydrogen sulfide gas (˜2 mL) was condensed into a cooled (−78° C.) solution of 2.8 grams (6.8 mmol) of 2-[2-(5-Bromo-2-methoxy-phenyl)-ethyl]-3-chloro-thiobenzimidic acid ethyl ester and 13.6 mL (13.6 mmol) of 1.0 M HCl/ether in 100 mL of tetrahydrofuran. The reaction was heated to 45° C. and stirred overnight in a sealed tube. The reaction mixture was diluted with water and extracted with methylene chloride once. The organic layer was washed with brine, dried (MgSO4), filtered and evaporated to give a crude orange oil. The oil was partially purified by chromatography through a short column of silica gel (eluting with 5:95 ethyl acetate/hexanes) which resulted in 1.8 g of an orange powder which was used directly in the next step.

Fuente