Dimethylformamide → tert-butyl 6-(2-ethoxy-2-oxoethyl)-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

HRID 1071041

Reaction equation

[CH2:1]1[C:14]2[C:13]3[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=3[NH:7][C:6]=2[CH2:5][CH2:4][N:3]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:2]1.CN(C)C=O.[H-].[Na+].Br[CH2:30][C:31]([O:33][CH2:34][CH3:35])=[O:32]>O>[CH2:34]([O:33][C:31](=[O:32])[CH2:30][N:7]1[C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][C:13]=2[C:14]2[CH2:1][CH2:2][N:3]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:4][CH2:5][C:6]1=2)[CH3:35]

Participants

Conditions

Temperature: 0 °C

Procedure

To a mixture of tert-butyl 1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate (3.557 g, 12.42 mmol) and N,N-dimethylformamide (30 mL) was added 60% sodium hydride (0.596 g, 14.90 mmol). The mixture stirred for 1 h, and then cooled in a 0° C. bath. Ethyl bromoacetate was added, and the mixture warmed to room temperature. Water then was added and the mixture was evaporated in vacuo. The residue was taken up in ethyl acetate and washed with water. Evaporation and trituration with hexanes provided 3.289 g of the title compound, the structure of which is shown in FIG. 6 as (23) (where n=1).

Workup

temperaturethe mixture warmed to room temperature
customthe mixture was evaporated in vacuo
washwashed with water
customEvaporation and trituration with hexanes

Sources & evidence

ORD record: ord-b3af96bfd4bd41c69c1bc8fed50dabcb
Source dataset: uspto-grants-2005_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06903090B2

Linked notes

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