L-Proline → 3'-{[3-(methylsulfonyl)pyridin-2-yl]methyl}-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,1'-inden]-2'(3'H)-one

HRID 1407836Notes

Reaction equation

HRID 1407836 reaction equation
Br[C:2]1[C:3]([CH2:8][CH:9]2[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[C:11]3([C:29]4[C:20](=[CH:21][C:22]5[O:27][CH2:26][CH2:25][O:24][C:23]=5[CH:28]=4)[O:19][CH2:18]3)[C:10]2=[O:30])=[N:4][CH:5]=[CH:6][CH:7]=1.[CH3:31][S:32]([O-])(=[O:34])=[O:33].[Na+].[Na].N1CCC[C@H]1C(O)=O>CS(C)=O.C(OCC)(=O)C.[Cu](I)I>[CH3:31][S:32]([C:2]1[C:3]([CH2:8][CH:9]2[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[C:11]3([C:29]4[C:20](=[CH:21][C:22]5[O:27][CH2:26][CH2:25][O:24][C:23]=5[CH:28]=4)[O:19][CH2:18]3)[C:10]2=[O:30])=[N:4][CH:5]=[CH:6][CH:7]=1)(=[O:34])=[O:33]

Participants

8

Reactant 4

HCID 145742L-ProlineHCID 638112Sodium methanesulfonateHCID 5360545SodiumHCID 673576033'-[(3-Bromopyridin-2-yl)methyl]-2,3-dihydrospiro[furo[2,3-g][1,4]-benzodioxine-8,1'-inden]-2'(3'H)-one

Product 1

HCID 673565253'-{[3-(methylsulfonyl)pyridin-2-yl]methyl}-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,1'-inden]-2'(3'H)-oneYield 44.4%

Reagents, catalysts & solvents 3

HCID 83717Copper iodideCatalystHCID 679Dimethyl SulfoxideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
95 °C

Procedure

A mixture of 3′-[(3-bromopyridin-2-yl)methyl]-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,1′-inden]-2′(3′H)-one (0.233 g, 0.50 mmol), sodium methanesulfonate (0.071 g, 0.60 mmol), copper iodide (0.010 g, 0.05 mmol), and the sodium salt of L-proline (0.014 g, 0.10 mmol) were combined in dimethyl sulfoxide (1 mL) and heated at 95° C. for 48 h, then stirred at ambient temperature for 30 h. The reaction mixture was diluted with ethyl acetate (50 mL) and washed with water (100 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The residue was triturated from methanol and further purified by column chromatography, and eluted with a 0% to 50% gradient of ethyl acetate in dichloromethane to yield 3′-{[3-(methylsulfonyl)pyridin-2-yl]methyl}-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,1′-inden]-2′(3′H)-one (0.103 g, 44%) as a colorless solid: mp>250° C.; 1H NMR (300 MHz, DMSO-d6) δ 8.69 (d, J=4.2 Hz, 1H), 8.35 (dd, J=8.0, 0.5 Hz, 1H), 7.64 (dd, J=7.9, 4.7 Hz, 1H), 7.24 (dd, J=7.7, 7.7 Hz, 1H), 7.18 (d, J=7.3 Hz, 1H), 7.05-6.99 (m, 2H), 6.50 (s, 1H), 6.39 (s, 1H), 5.50 (ABq, 2H), 4.76 (ABq, 2H), 4.19-4.12 (m, 4H), 3.52 (s, 3H); 13C NMR (75 MHz, DMSO-d6) δ 177.6, 155.0, 153.7, 153.6, 144.6, 143.4, 138.4, 138.2, 135.9, 132.4, 129.1, 124.1, 123.9, 123.3, 122.1, 112.2, 109.8, 99.1, 79.6, 64.7, 64.1, 57.7, 44.2, 42.7; MS (ES+) m/z 465.0 (M+1).

Workup

  1. washwashed with water (100 mL)
  2. dry with materialdried over sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customThe residue was triturated from methanol
  6. customfurther purified by column chromatography
  7. washeluted with a 0% to 50% gradient of ethyl acetate in dichloromethane

Sources & evidence

ORD record
ord-a02796799cd54b38bddde3c1080cadb1
Source dataset
uspto-grants-2014_12
Patent number
US08916580B2

Reaction notes

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