Diisobutylaluminumhydride → 286836-24-6

A solution of 0.63 gm (2.46 mMol) 5-methoxycarbonyl-7-bromobenzofuran in 10 mL toluene was cooled to −78° C. When material precipitated, 5 mL dichloromethane were added to effect solution. To this solution were then slowly added 1.5 mL (8.6 mMol) diisobutylaluminum hydride and the reaction mixture was allowed to warm gradually to room temperature. After 10 minutes the reaction was quenched by the addition of methanol followed by 1.5 gm sodium fluoride and 50 mL water and then Rochelle's salt solution. The mixture was diluted with additional dichloromethane and was stirred vigorously for about 1 hour. The phases were separated and the aqueous phase extracted well with ethyl acetate. The organic phases were combined and concentrated under reduced pressure. The residue was crystallized from hexane and dichloromethane to provide 0.46 gm (82%) of the title compound as a white crystalline solid.

1. customWhen material precipitated
2. addition5 mL dichloromethane were added to effect solution
3. customAfter 10 minutes the reaction was quenched by the addition of methanol
4. additionThe mixture was diluted with additional dichloromethane
5. customThe phases were separated
6. extractionthe aqueous phase extracted well with ethyl acetate
7. concentrationconcentrated under reduced pressure
8. customThe residue was crystallized from hexane and dichloromethane

ORD record

ord-7091a5d4a5be4dae9c8fcb1301ea8175

Source dataset

uspto-grants-2005_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06881733B1