1,4-Dibromobutane → 5-(4-Bromo-butoxy)-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester

HRID 49497Notes

Reaction equation

[C:1]([O:5][C:6]([N:8]1[C:16]2[C:11](=[CH:12][C:13]([OH:17])=[CH:14][CH:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C([O-])([O-])=O.[K+].[K+].[Br:24][CH2:25][CH2:26][CH2:27][CH2:28]Br>CC(C)=O>[C:1]([O:5][C:6]([N:8]1[C:16]2[C:11](=[CH:12][C:13]([O:17][CH2:28][CH2:27][CH2:26][CH2:25][Br:24])=[CH:14][CH:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

Conditions

Temperature: 50 °C

Procedure

9.41 g (40 mmol) 5-Hydroxy-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester in 90 ml acetone were treated with 16.6 g (6 mmol) K2CO3 (powdered) and 17.3 g (5 mmol) 1,4-dibromobutane. The suspension was stirred at 50° C. for 4 h, cooled to RT, filtered and concentrated. Column chromatography on silica gel with CH2Cl2 yielded 8.8 g (60%) 5-(4-Bromo-butoxy)-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester as colorless solid, MS: 370 (MH+, 1Br).

Workup

temperaturecooled to RT
filtrationfiltered
concentrationconcentrated

Sources & evidence

ORD record: ord-e9729515dd15438ca39c8d8717dc68d8
Source dataset: uspto-grants-2004_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06706751B2

Reaction notes

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