Cesium carbonate → 1'-(tetrahydro-2H-pyran-2-ylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one

HRID 2385221Notes

Reaction equation

HRID 2385221 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].Br[CH2:23][CH:24]1[CH2:29][CH2:28][CH2:27][CH2:26][O:25]1.C(=O)([O-])[O-].[Cs+].[Cs+]>CC(=O)CC>[O:25]1[CH2:26][CH2:27][CH2:28][CH2:29][CH:24]1[CH2:23][N: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]

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 1419172-(Bromomethyl)tetrahydro-2H-pyranHCID 592633545,6-dihydro-2H-spiro[benzofuro[6,5-b]furan-3,3'-indolin]-2'-one

Product 1

HCID 593526301'-(tetrahydro-2H-pyran-2-ylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-oneYield 82.1%

Reagents, catalysts & solvents 1

HCID 6569Methyl Ethyl KetoneSolvent

Procedure

A mixture of 5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one (0.28 g, 1.0 mmol), 2-(bromomethyl)tetrahydro-2H-pyran (0.36 g, 2.0 mmol) and cesium carbonate (1.00 g, 3.0 mmol) was stirred in butanone at 80° C. for 3 h. Upon cooling to ambient temperature, the reaction mixture was filtered, and the filtrate was evaporated under reduced pressure. The residue was subjected to column chromatography with ethyl acetate-hexanes (1:5-1:1) to afford 1′-(tetrahydro-2H-pyran-2-ylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one (0.31 g, 82%) as a colorless solid: 1H NMR (300 MHz, CDCl3) δ7.38-6.94 (m, 4H), 6.47 (d, J=2.9 Hz, 1H), 6.38 (s, 1H), 4.79 (ABq, 2H), 4.50 (t, J=8.6 Hz, 2H), 4.01-3.61 (m, 4H), 3.37 (t, J=11.1 Hz, 1H), 2.97 (t, J=8.4 Hz, 2H), 1.97-1.27 (m, 6H); 13C NMR (75 MHz, CDCl3) δ178.1 (2C), 161.7 (2C), 161.3, 161.2, 143.2, 143.1, 132.8, 132.7, 128.6 (2C), 123.5, 123.1, 123.1, 120.6, 120.5, 119.8 (2C), 119.0, 118.9, 109.7, 93.2, 93.1, 80.6, 75.7, 75.5, 72.3, 68.4 (2C), 57.7, 57.6, 45.8, 45.7, 29.6, 29.5, 29.1, 25.8, 23.0; MS (ES+) m/z 378.3 (M+1).

Workup

  1. filtrationthe reaction mixture was filtered
  2. customthe filtrate was evaporated under reduced pressure

Sources & evidence

ORD record
ord-7cebea6463b04f1283e4546ad25be9da
Source dataset
uspto-grants-2012_09
Patent number
US08263606B2

Reaction notes

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