Hydrochloric Acid → 6-fluoro-2,3-dihydro-1H-indole

To a stirred solution of 6-fluoro-1H-indole (21.0 g, 0.155 mol) in dioxane (210 mL) was added BH3—NEt3 (92 mL, 0.620 mol) and a 12 M solution of HCl (27 mL, 0.326 mol) dropwise. The reaction mixture was stirred at room temperature for 10 min then at reflux for 2.5 h. The mixture was cooled to room temperature, and 6 M HCl (210 mL) was added. The mixture stirred at room temperature for 10 min and then at reflux for 1.5 h. The dioxane was removed under reduced pressure, and the residue diluted with water (500 mL) and washed with diethyl ether (1×250 mL). The aqueous fraction was basified with 10% NaOH and extracted with diethyl ether (3×250 mL). The combined organic layers were washed with water (2×100 mL) and brine (100 mL), dried (Na2SO4) and concentrated under reduced pressure, giving 22.3 g of the title compound.

1. temperatureat reflux for 2.5 h
2. temperatureThe mixture was cooled to room temperature
3. stirringThe mixture stirred at room temperature for 10 min
4. temperatureat reflux for 1.5 h
5. customThe dioxane was removed under reduced pressure
6. additionthe residue diluted with water (500 mL)
7. washwashed with diethyl ether (1×250 mL)
8. extractionextracted with diethyl ether (3×250 mL)
9. washThe combined organic layers were washed with water (2×100 mL) and brine (100 mL)
10. dry with materialdried (Na2SO4)
11. concentrationconcentrated under reduced pressure

ORDレコード

ord-4ad199834eb640c58c9db1a5d9644a5a

出典データセット

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08372875B2