Borane;tetrahydrofuran → ethyl 7-bromo-3-(3-hydroxypropyl)-1H-indole-2-carboxylate
Reaction equation
[Br:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:10]=1[NH:9][C:8]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[C:7]2[CH2:16][CH2:17][C:18](OCC)=[O:19].B.C1COCC1>C1COCC1>[Br:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:10]=1[NH:9][C:8]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[C:7]2[CH2:16][CH2:17][CH2:18][OH:19]Participants
4
Procedure
To a mixture of EXAMPLE 1A (1.85 g) in THF (50 mL) was added 1M borane THF (30 mL). The mixture was stirred at room temperature for 16 hours, quenched with methanol (10 mL) and concentrated. The concentrate was purified by flash column chromatography on silica gel with 5-25% ethyl acetate/hexanes.