Potassium Carbonate → Tert-butyl 4-(2-(1-acetylindolin-5-yl)ethyl)piperazine-1-carboxylate

HRID 535648

Reaction equation

[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(=O)([O-])[O-].[K+].[K+].[C:20]([N:23]1[C:31]2[C:26](=[CH:27][C:28]([C:32](=O)[CH2:33]Br)=[CH:29][CH:30]=2)[CH2:25][CH2:24]1)(=[O:22])[CH3:21]>C(#N)C>[C:20]([N:23]1[C:31]2[C:26](=[CH:27][C:28]([CH2:32][CH2:33][N:11]3[CH2:12][CH2:13][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:7])[CH2:9][CH2:10]3)=[CH:29][CH:30]=2)[CH2:25][CH2:24]1)(=[O:22])[CH3:21]

Participants

Conditions

Temperature: 70 °C

Procedure

To a solution of piperazine-1-carboxylic acid tert-butyl ester (0.750 g, 4.03 mmol) in dry acetonitrile (20 mL) grounded potassium carbonate (0.486 mL, 8.05 mmol) was added followed by the product mixture from Example 38a (1.134 g) and the reaction was heated at 70° C. under argon over night. The acetonitrile was evaporated and DCM and water was added. The layers were separated and the aq phase was extracted with DCM (3×). The combined organic phases were dried (Na2SO4), filtered and evaporated. The crude mixture was purified by flash chromatography (heptane/EtOAc 75/25 to 0/100) to give 0.823 g (55%) of the title compound.

Workup

additionwas added
customThe acetonitrile was evaporated
additionDCM and water was added
customThe layers were separated
extractionthe aq phase was extracted with DCM (3×)
dry with materialThe combined organic phases were dried (Na2SO4)
filtrationfiltered
customevaporated
customThe crude mixture was purified by flash chromatography (heptane/EtOAc 75/25 to 0/100)

Sources & evidence

ORD record: ord-2270defa2db742d6b09fed1e47e2d406
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08859534B2

Linked notes

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