Isoamyl Nitrite → 1-(4-bromo-2-methylsulfanyl-phenyl)-5-methyl-1H-tetrazole

Temperature

85 °C

A solution of isoamyl nitrite (402 μL, 3 mmol) in dimethyl disulfide (2 mL, 22 mmol) at 25° C. was slowly treated with 5-bromo-2-(5-methyl-tetrazol-1-yl)-phenylamine (0.51 g, 2 mmol). The reaction was exothermic with gas evolution. The resulting brown reaction mixture was heated to 80-90° C. for 2 h, at which time, thin layer chromatography analysis of the reaction mixture indicated the absence of starting material. The reaction mixture was cooled to 25° C. and then concentrated in vacuo. The resulting residue was dissolved in ethyl acetate (50 mL). The organic layer was washed successively with a 1N aqueous hydrochloric acid solution (1×50 mL) and a saturated aqueous sodium chloride solution (1×50 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40M, Silica, 6/1 to 5/1 hexanes/ethyl acetate) afforded 1-(4-bromo-2-methylsulfanyl-phenyl)-5-methyl-1H-tetrazole (0.8 g) as a brown solid that was used without further purification and characterization.

1. temperatureThe reaction mixture was cooled to 25° C.
2. concentrationconcentrated in vacuo
3. dissolutionThe resulting residue was dissolved in ethyl acetate (50 mL)
4. washThe organic layer was washed successively with a 1N aqueous hydrochloric acid solution (1×50 mL)
5. dry with materiala saturated aqueous sodium chloride solution (1×50 mL), dried over anhydrous magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo

ORD record

ord-918a5e89c2004c6c99b4c2aa19ab0571

Source dataset

uspto-grants-2002_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06369232B1