Cesium carbonate → HCID 59352350, compound

HRID 1965323Notes

Reaction equation

HRID 1965323 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) δ 8177.6, 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-b2d4bd23a4874aada2fb8ff180f936cb
Source dataset
uspto-grants-2013_04
Patent number
US08415370B2

Reaction notes

Loading…