4-(1-Piperidylmethyl)phenylboronic Acid → tert-Butyl-{3-(4-piperidin-1-ylmethyl-phenyl)-9H-dipyrido[2,3-b;4',3'-d]pyrrol-6-yl}-carbamate

HRID 1506033Notes

Reaction equation

HRID 1506033 reaction equation
[C:1]([O:5][C:6](=[O:22])[NH:7][C:8]1[N:16]=[CH:15][C:14]2[NH:13][C:12]3[N:17]=[CH:18][C:19](Br)=[CH:20][C:11]=3[C:10]=2[CH:9]=1)([CH3:4])([CH3:3])[CH3:2].[N:23]1([CH2:29][C:30]2[CH:35]=[CH:34][C:33](B(O)O)=[CH:32][CH:31]=2)[CH2:28][CH2:27][CH2:26][CH2:25][CH2:24]1>O1CCOCC1.C(=O)([O-])[O-].[Cs+].[Cs+].C(Cl)Cl.O>[C:1]([O:5][C:6](=[O:22])[NH:7][C:8]1[N:16]=[CH:15][C:14]2[NH:13][C:12]3[N:17]=[CH:18][C:19]([C:33]4[CH:32]=[CH:31][C:30]([CH2:29][N:23]5[CH2:28][CH2:27][CH2:26][CH2:25][CH2:24]5)=[CH:35][CH:34]=4)=[CH:20][C:11]=3[C:10]=2[CH:9]=1)([CH3:4])([CH3:3])[CH3:2]

Participants

7

Reactant 2

HCID 230053434-(1-Piperidylmethyl)phenylboronic AcidHCID 68346934tert-butyl-{3-Bromo-9H-dipyrido[2,3-b;4',3'-d]pyrrol-6-yl}-carbamate

Product 1

HCID 68346928tert-Butyl-{3-(4-piperidin-1-ylmethyl-phenyl)-9H-dipyrido[2,3-b;4',3'-d]pyrrol-6-yl}-carbamateYield 30.1%

Reagents, catalysts & solvents 4

HCID 962WaterSolventHCID 6344DichloromethaneSolvent2×HCID 10796Cesium carbonateSolventHCID 312751,4-DioxaneSolvent

Procedure

A degassed mixture of tert-butyl-{3-bromo-9H-dipyrido[2,3-b;4′,3′-d]pyrrol-6-yl}-carbamate (229 mg, 0.631 mmol), 4-piperidin-1-ylmethyl-phenyl boronic acid (207 mg, 0.946 mmol), and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) complex with dichloromethane (1:1) (51.5 mg, 6.31 μmol, 10.0 mol %) in 1,4-dioxane (12.4 mL) and 2M aqueous cesium carbonate (1.32 mL) was heated under reflux for 5 h. The mixture was allowed to cool to room temperature, diluted with DCM and water, and filtered to remove the precipitate. The filtrate layers were separated and the aqueous phase was extracted with DCM, and the combined organic phase concentrated in vacuo. The resultant residue was dissolved in 20% methanol in DCM and absorbed onto silica gel for purification by flash chromatography (silica, 11 g column, Biotage, 1-20% methanol in DCM) to afford the title compound as a beige solid (86.9 mg, 30%). 1H NMR (DMSO-D6, 400 MHz): 11.96 (s, 1H), 9.55 (s, 1H), 8.99 (d, J=1.9 Hz, 1H), 8.88 (d, J=2.2 Hz, 1H), 8.57 (d, J=7.8 Hz, 2H), 7.80 (d, J=8.1 Hz, 2H), 7.42 (d, J=8.1 Hz, 2H), 3.50 (s, 2H), 2.35 (m, 4H), 1.55-1.45 (m, 4H), 1.52 (s, 9H), 1.39 (m, 2H). LCMS (Method D): RT=9.11 min, M+H+=458.

Workup

  1. temperaturewas heated
  2. temperatureunder reflux for 5 h
  3. filtrationfiltered
  4. customto remove the precipitate
  5. customThe filtrate layers were separated
  6. extractionthe aqueous phase was extracted with DCM
  7. concentrationthe combined organic phase concentrated in vacuo
  8. dissolutionThe resultant residue was dissolved in 20% methanol in DCM
  9. customabsorbed onto silica gel for purification by flash chromatography (silica, 11 g column, Biotage, 1-20% methanol in DCM)

Sources & evidence

ORD record
ord-e5e90024af574254ae6ee62907633cdd
Source dataset
uspto-grants-2015_12
Patent number
US09216980B2

Reaction notes

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