Potassium Carbonate → 6-Chloro-5-(4-(1-hydroxycyclobutyl)phenyl)-1H-indole-3-carbaldehyde

HRID 338216Notes

Reaction equation

HRID 338216 reaction equation
Br[C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][C:10]=1[Cl:11])[NH:7][CH:6]=[C:5]2[CH:12]=[O:13].CC1(C)COB([C:21]2[CH:26]=[CH:25][C:24]([C:27]3([OH:31])[CH2:30][CH2:29][CH2:28]3)=[CH:23][CH:22]=2)OC1.C(=O)([O-])[O-].[K+].[K+].[NH4+].[Cl-]>CCO.C1(C)C=CC=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2].O>[Cl:11][C:10]1[CH:9]=[C:8]2[C:4]([C:5]([CH:12]=[O:13])=[CH:6][NH:7]2)=[CH:3][C:2]=1[C:21]1[CH:26]=[CH:25][C:24]([C:27]2([OH:31])[CH2:30][CH2:29][CH2:28]2)=[CH:23][CH:22]=1

Participants

9

Reactant 4

HCID 11430Potassium CarbonateHCID 25517Ammonium ChlorideHCID 866985665-bromo-6-chloro-1H-indole-3-carbaldehydeHCID 866985671-(4-(5,5-Dimethyl-1,3,2-dioxaborinan-2-yl)phenyl)cyclobutanol

Product 1

HCID 866985686-Chloro-5-(4-(1-hydroxycyclobutyl)phenyl)-1H-indole-3-carbaldehydeYield 64.2%

Reagents, catalysts & solvents 4

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 702EthanolSolventHCID 962WaterSolventHCID 1140TolueneSolvent

Conditions

Temperature
110 °C

Procedure

A mixture of 5-bromo-6-chloro-1H-indole-3-carbaldehyde (6.15 g, 23.8 mmol), 1-[4-(5,5-dimethyl-[1,3,2]dioxaborinan-2-yl)-phenyl]-cyclobutanol (8.35 g, 32.1 mmol), 2M aqueous potassium carbonate (47.5 mL, 95.0 mmol) in EtOH (33 mL) and toluene (86 mL) was degassed with N2 for 25 minutes, then treated with [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (1.93 g, 2.64 mmol). The reaction mixture was heated to 110° C. and stirred for 2 hours. The reaction mixture was cooled to room temperature, poured into a 3:1 mixture of saturated aqueous NH4Cl solution/water (450 mL) and extracted with EtOAc (10×150 mL), followed by 9:1 CH2Cl2/i-PrOH (4×100 mL). The combined organic layers were dried over Na2SO4 and concentrated in vacuo. The crude material was purified by flash chromatography (0-100% EtOAc/heptane, with 0.03% formic acid modifier) to afford the title compound (4.98 g, 64%) as a red solid. MS (ES+) 326.5 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ 12.21 (br. s., 1H), 9.91 (s, 1H), 8.35 (s, 1H), 8.02 (s, 1H), 7.67 (s, 1H), 7.54 (d, J=8.00 Hz, 2H), 7.38 (d, J=8.20 Hz, 2H), 5.50 (s, 1H), 2.36-2.45 (m, 2H), 2.22-2.33 (m, 2H), 1.92 (m, 1H), 1.61-1.71 (m, 1H).

Workup

  1. customwas degassed with N2 for 25 minutes
  2. temperatureThe reaction mixture was cooled to room temperature
  3. extractionextracted with EtOAc (10×150 mL)
  4. dry with materialThe combined organic layers were dried over Na2SO4
  5. concentrationconcentrated in vacuo
  6. customThe crude material was purified by flash chromatography (0-100% EtOAc/heptane, with 0.03% formic acid modifier)

Sources & evidence

ORD record
ord-aa5f4faa416d4dffb0ebe7aebee1bd64
Source dataset
uspto-grants-2014_11
Patent number
US08889730B2

Reaction notes

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