Cesium carbonate → HCID 59352350, compound

HRID 1407472Notes

Reaction equation

HRID 1407472 reaction equation
[NH:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[C:3]2([CH2:13][O:12][C:11]3[CH:14]=[C:15]4[C:19](=[CH:20][C:10]2=3)[CH2:18][CH2:17][O:16]4)[C:2]1=[O:21].Cl[CH2:23][C:24]1[O:25][CH:26]=[C:27]([C:29]([O:31][CH3:32])=[O:30])[N:28]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>CC(=O)CC>[O:21]=[C:2]1[C:3]2([CH2:13][O:12][C:11]3[CH:14]=[C:15]4[C:19](=[CH:20][C:10]2=3)[CH2:18][CH2:17][O:16]4)[C:4]2[C:9](=[CH:8][CH:7]=[CH:6][CH:5]=2)[N:1]1[CH2:23][C:24]1[O:25][CH:26]=[C:27]([C:29]([O:31][CH3:32])=[O:30])[N:28]=1

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 2763199Methyl 2-(chloromethyl)oxazole-4-carboxylateHCID 592633545,6-dihydro-2H-spiro[benzofuro[6,5-b]furan-3,3'-indolin]-2'-one

Product 1

HCID 59352350HCID 59352350, compoundYield 63.7%

Reagents, catalysts & solvents 1

HCID 6569Methyl Ethyl KetoneSolvent

Procedure

A suspended mixture of 5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one (1.00 g, 3.3 mmol), methyl 2-(chloromethyl)oxazole-4-carboxylate (2.00 g, 11.4 mmol) and cesium carbonate (4.00 g, 12.3 mmol) in butanone (50 mL) was refluxed for 5 h under nitrogen. The reaction mixture was cooled to ambient temperature and filtered. The solid was washed with acetone (50 mL). The filtrate was concentrated in vacuo to dryness. The residue was purified by column chromatography with a 30% to 70% gradient of ethyl acetate in hexanes to afford methyl 2-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]-1,3-oxazole-4-carboxylate (0.88 g, 61%) as a colorless solid: 1H NMR (300 MHz, DMSO-d6) δ 8.17 (s, 1H), 7.27-6.91 (m, 4H), 6.53 (s, 1H), 6.38 (s, 1H), 5.12 (ABq, 2H), 4.81 (ABq 2H), 4.51 (t, J=8.7 Hz, 2H), 3.89 (s, 3H), 3.04-2.91 (m, 2H); 13C NMR (75 MHz, DMSO-d6) δ177.6, 161.9, 161.2, 161.2, 159.2, 145.0, 141.0, 133.6, 132.5, 129.0, 124.1, 120.1, 119.9, 199.1, 108.8, 93.2, 80.5, 72.4, 57.7, 52.3, 37.2, 29.0; MS (ES+) m/z 419.2 (M+1).

Workup

  1. temperaturewas refluxed for 5 h under nitrogen
  2. filtrationfiltered
  3. washThe solid was washed with acetone (50 mL)
  4. concentrationThe filtrate was concentrated in vacuo to dryness
  5. customThe residue was purified by column chromatography with a 30% to 70% gradient of ethyl acetate in hexanes

Sources & evidence

ORD record
ord-3287f7be207640a28d800021ed3be4a8
Source dataset
uspto-grants-2014_12
Patent number
US08916580B2

Reaction notes

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