Phosphorus tribromide → 3-(3-bromopropyl)-1H-indole

Participants

Reaction Conditions

Reaction Steps

Phosphorus tribromide (17.4 g) in Et2O (30 mL) was added dropwise to a Et20 solution (100 mL) containing 3-(3-hydroxypropyl)indole (VI; 7.5 g) at 0° C. with stirring and under N2 atmosphere. After the addition was complete, the reaction was allowed to warm to 23° C. and continuously stirred for 16 h. At the end of this time, the reaction was cooled to 0° C. and ice (ca. 25 mL) added portionwise and stirred an additional 2 h. The organic phase was separated from the aqueous phase and the aqueous layer extracted with Et2O. The combined organic phases were washed with sat. NaCl solution, dried with MgSO4. filtered and concentrated under reduced pressure to afford 3-(3-bromopropyl)indole (V; 1.51 g; 15%).

Provenance & Evidence