反应详情

A mixture of 4-chloropyridine hydrochloride (7.25 g), 5-mercapto-1H-tetrazole (4.93 g) and triethylamine (14.64 g) in dimethylformamide (120 ml) was stirred for one hour at 82° to 85° C. and then cooled in an ice bath. The resulting precipitates were removed by filtration and the filtrate was mixed with water (60 ml). The aqueous solution was adjusted to pH 2 with 2N hydrochloric acid and evaporated to dryness under reduced pressure. The residue was triturated in chloroform (300 ml) and the resulting precipitates were collected by filtration and washed with the same solvent. To the precipitates was added ethanol (650 ml) and an insoluble material was removed by filtration. The filtrate was evaporated to dryness to give 4-(1H-tetrazol-5-ylthio)pyridine (4.03 g), mp. 159° to 161° C. (dec.).

1. temperaturecooled in an ice bath
2. customThe resulting precipitates
3. customwere removed by filtration
4. additionthe filtrate was mixed with water (60 ml)
5. customevaporated to dryness under reduced pressure
6. customThe residue was triturated in chloroform (300 ml)
7. customthe resulting precipitates
8. filtrationwere collected by filtration
9. washwashed with the same solvent
10. additionTo the precipitates was added ethanol (650 ml)
11. customan insoluble material was removed by filtration
12. customThe filtrate was evaporated to dryness