Hydrochloric Acid → 4-Bromo-6-isopropyl-2-methyl-1H-indene

Temperature

0 °C

To a solution of 22.2 g (83.2 mmol) of 7-bromo-5-isopropyl-2-methyl-1-indanone in 120 ml of THF-methanol (2:1, vol.), 5.06 g (133 mmol) of NaBH4 was added, while vigorously stirring, over 3 h at 0° C. This mixture was stirred overnight at room temperature; then, 300 ml of cold water was added and the resulting mixture was acidified with 1 M HCl to pH 1. The organic layer was separated, and the aqueous layer was extracted with 3×150 ml of dichloromethane. The combined extract was dried over K2CO3 and evaporated to dryness, and 200 ml of toluene was added to the yellowish oil obtained. This toluene solution was treated with a catalytic amount of pTolSO3H (ca. 0.2 g) for 1 h at reflux, cooled to room temperature, and evaporated to dryness. The crude product was purified using flash chromatography on Silica Gel 60 (40-63 μm, d 40 mm, l 400 mm; eluent: hexanes). Yield 19.6 g (94%).

1. stirringThis mixture was stirred overnight at room temperature
2. customThe organic layer was separated
3. extractionthe aqueous layer was extracted with 3×150 ml of dichloromethane
4. extractionThe combined extract
5. dry with materialwas dried over K2CO3
6. customevaporated to dryness, and 200 ml of toluene
7. additionwas added to the yellowish oil
8. customobtained
9. temperatureat reflux
10. temperaturecooled to room temperature
11. customevaporated to dryness
12. customThe crude product was purified

ORD record

ord-ba3c01de7b124447b540e0abc4ef0b98

Source dataset

uspto-grants-2008_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07446216B2