Stannous chloride dihydrate → HCID 178505433, compound

Temperature

-3 °C

To a suspension of 1-(2-amino-4-fluorophenyl)-4-chloro-1-butanone (500 mg, 2.3 mmol) in conc. HCl (3.2 mL) was added a solution of NaNO2 in H2O (0.7 mL) and stirred for 1 h at −6-0° C. A solution of SnCl2.2H2O (1.25 g, 5.51 mmol) in conc. HCl (1.7 mL) was added the reaction mixture and stirred for additional 1 h at 0° C. The reaction was quenched by addition of ice water and extracted with Et2O. The combined organic layer was washed with H2O and brine, dried over MgSO4, filtered and concentrated in vacuo to give a white solid. It was recrystalized to give pure 3-(3-chloropropyl)-6-fluoroindazole (420 mg, 86%).

1. stirringstirred for additional 1 h at 0° C
2. customThe reaction was quenched by addition of ice water
3. extractionextracted with Et2O
4. washThe combined organic layer was washed with H2O and brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customto give a white solid
9. customIt was recrystalized

ORD record

ord-4c16756ab1904c2ba378803e01bc4c70

Source dataset

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06713471B1