Cesium carbonate → 5-(4-tert-Butoxycarbonyl-[1,4]diazepane-1-carbonyl)-1-isopropyl-1H-indole-2-carboxylic acid ethyl ester

HRID 1992493Notes

Reaction equation

[CH2:1]([O:3][C:4]([C:6]1[NH:7][C:8]2[C:13]([CH:14]=1)=[CH:12][C:11]([C:15]([N:17]1[CH2:23][CH2:22][CH2:21][N:20]([C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])[CH2:19][CH2:18]1)=[O:16])=[CH:10][CH:9]=2)=[O:5])[CH3:2].C(=O)([O-])[O-].[Cs+].[Cs+].[CH:37](CS([O-])(=O)=O)([CH3:39])[CH3:38]>C(#N)C>[CH2:1]([O:3][C:4]([C:6]1[N:7]([CH:37]([CH3:39])[CH3:38])[C:8]2[C:13]([CH:14]=1)=[CH:12][C:11]([C:15]([N:17]1[CH2:23][CH2:22][CH2:21][N:20]([C:24]([O:26][C:27]([CH3:29])([CH3:28])[CH3:30])=[O:25])[CH2:19][CH2:18]1)=[O:16])=[CH:10][CH:9]=2)=[O:5])[CH3:2]

Participants

Conditions

Temperature: 95 °C

Procedure

To a solution of 5-(4-tert-butoxycarbonyl-[1,4]diazepane-1-carbonyl)-1H-indole-2-carboxylic acid ethyl ester (1.55 g, 3.5 mmol) in acetonitrile (25 ml) under an argon atmosphere were added caesium carbonate (2 eq., 2.44 g) and isopropylmethanesulfonate (2 eq., 1.03 g). The mixture was heated at 95° C. (oil-bath temperature) overnight. The mixture was cooled to room temperature and evaporated under reduced pressure. The crude product was purified by column chromatography on silica gel (3:1 heptane/ethyl acetate eluant) to afford the product as a light-brown oil (1.6 g, 93%). MS (m/z): 458.3 (M+H)+.

Workup

temperatureThe mixture was cooled to room temperature
customevaporated under reduced pressure
customThe crude product was purified by column chromatography on silica gel (3:1 heptane/ethyl acetate eluant)

Sources & evidence

ORD record: ord-f7720254379a46edacf8c8e8d13001fe
Source dataset: uspto-grants-2010_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07648979B2

Reaction notes

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