Potassium Carbonate → 6-chloro-5-(4-(3-hydroxyoxetan-3-yl)phenyl)-1H-indole-3-carbaldehyde

HRID 1054570Notes

Reaction equation

HRID 1054570 reaction equation
CC1(C)COB(B2OCC(C)(C)CO2)OC1.C([O-])(=O)C.[K+].Br[C:23]1[CH:28]=[CH:27][C:26]([C:29]2([OH:33])[CH2:32][O:31][CH2:30]2)=[CH:25][CH:24]=1.Br[C:35]1[CH:36]=[C:37]2[C:41](=[CH:42][C:43]=1[Cl:44])[NH:40][CH:39]=[C:38]2[CH:45]=[O:46].C(=O)([O-])[O-].[K+].[K+]>O1CCOCC1.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].CCO.C1(C)C=CC=CC=1>[Cl:44][C:43]1[CH:42]=[C:41]2[C:37]([C:38]([CH:45]=[O:46])=[CH:39][NH:40]2)=[CH:36][C:35]=1[C:23]1[CH:28]=[CH:27][C:26]([C:29]2([OH:33])[CH2:32][O:31][CH2:30]2)=[CH:25][CH:24]=1

Participants

10

Reactant 5

HCID 11430Potassium CarbonateHCID 517044Potassium AcetateHCID 2734316Bis(neopentyl glycolato)diboronHCID 583823793-(4-Bromophenyl)oxetan-3-olHCID 866985665-bromo-6-chloro-1H-indole-3-carbaldehyde

Product 1

HCID 866985766-chloro-5-(4-(3-hydroxyoxetan-3-yl)phenyl)-1H-indole-3-carbaldehydeYield 35.5%

Reagents, catalysts & solvents 4

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)Catalyst2×HCID 702EthanolSolventHCID 1140TolueneSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
110 °C

Procedure

A mixture of 5,5,5′,5′-tetramethyl-[2,2′]bi[[1,3,2]dioxaborinanyl] (149.0 mg, 0.44 mmol), oven dried potassium acetate (173.0 mg, 1.75 mmol) and 3-(4-bromo-phenyl)-oxetan-3-ol (100.0 mg, 0.44 mmol) in 1,4-dioxane (2 mL) was degassed with N2 for 5 minutes, treated with [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (33.0 mg, 0.044 mmol) and subjected to microwave irradiation at 110° C. for 1 hour. The cooled reaction mixture was filtered through celite and concentrated in vacuo to give a black oil. To the dark oil was added 5-bromo-6-chloro-1H-indole-3-carbaldehyde (112.0 mg, 0.43 mmol), 2 N aqueous potassium carbonate (0.4 mL, 0.80 mmol), toluene (1.5 mL) and EtOH (0.5 mL). The reaction mixture was degassed with N2 for 10 minutes, treated with [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (25.0 mg, 0.034 mmol), and heated in a pressure tube to 110° C. for 2 hours. The cooled reaction mixture was purified by flash chromatography (33-100% EtOAc/heptanes) to give a solid. The solid was triturated in MeOH and filtered to afford the title compound (50 mg, 35%) as a yellow solid. MS (ES+) 328.0 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ 12.23 (s, 1 H), 9.92 (s, 1 H), 8.35 (s, 1 H), 8.02 (s, 1 H), 7.66 (d, J=9.4 Hz, 2 H), 7.44 (d, J=8.2 Hz, 2 H), 6.36 (s, 1 H), 4.80-4.76 (m, 2 H), 4.75-4.71 (m, 2 H).

Workup

  1. customwas degassed with N2 for 5 minutes
  2. customirradiation at 110° C. for 1 hour
  3. customThe cooled reaction mixture
  4. filtrationwas filtered through celite and
  5. concentrationconcentrated in vacuo
  6. customto give a black oil
  7. customThe reaction mixture was degassed with N2 for 10 minutes
  8. customThe cooled reaction mixture
  9. customwas purified by flash chromatography (33-100% EtOAc/heptanes)
  10. customto give a solid
  11. customThe solid was triturated in MeOH
  12. filtrationfiltered

Sources & evidence

ORD record
ord-d771ff7e91b54576a2a47e719939a8b6
Source dataset
uspto-grants-2016_07
Patent number
US09394285B2

Reaction notes

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