Sodium Azide → 1-(5-bromo-2-methanesulfonyl-phenyl)-5-methyl-1H-tetrazole

Temperature

0 °C

A solution of N-(5bromo-2-methanesulfonyl-phenyl)-acetamide (350 mg, 1.2 mmol) in acetonitrile (6 mL) at 25° C. was treated with sodium azide (78 mg, 1.2 mmol). The reaction mixture was cooled to 0° C. and then treated with trifluoromethanesulfonic anhydride (0.24 mL, 1.2 mmol). The resulting reaction mixture was allowed to warn to 25° C. where it was stirred overnight, at which time, thin layer chromatography analysis of the reaction mixture indicated the absence of starting material. The reaction mixture was then concentrated in vacuo. The resulting residue was diluted with ethyl acetate (50 mL) and water (50 mL). The two layers were separated, and the aqueous layer was extracted with ethyl acetate (1×30 mL). The combined organic extracts were washed with a saturated aqueous sodium chloride solution (1×100 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40M, Silica, 8/1 hexanes/ethyl acetate) afforded 1-(5-bromo-2-methanesulfonyl-phenyl)-5-methyl-1H-tetrazole (254 mg, 67%) as a white solid: mp 174-184° C.; EI-HRMS m/e calcd for C9H9BrN4O2S (M+) 315.9630, found 315.9634.

1. customThe resulting reaction mixture
2. customto warn to 25° C.
3. concentrationThe reaction mixture was then concentrated in vacuo
4. additionThe resulting residue was diluted with ethyl acetate (50 mL) and water (50 mL)
5. customThe two layers were separated
6. extractionthe aqueous layer was extracted with ethyl acetate (1×30 mL)
7. washThe combined organic extracts were washed with a saturated aqueous sodium chloride solution (1×100 mL)
8. dry with materialdried over anhydrous magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo

ORD record

ord-2fca5ccf648147eb97f51fd3ea7bea5a

Source dataset

uspto-grants-2002_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06441180B1