L-Proline → 1'-{[5-(methylsulfonyl)-2-furyl]methyl}spiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-2'(1'H)one

HRID 645248Notes

Reaction equation

HRID 645248 reaction equation
Br[C:2]1[O:6][C:5]([CH2:7][N:8]2[C:16]3[C:11](=[CH:12][CH:13]=[CH:14][CH:15]=3)[C:10]3([C:20]4=[CH:21][C:22]5[O:26][CH2:25][O:24][C:23]=5[CH:27]=[C:19]4[O:18][CH2:17]3)[C:9]2=[O:28])=[CH:4][CH:3]=1.[CH3:29][S:30]([O-:32])=[O:31].[Na+].N1CCC[C@H]1C(O)=O>[Cu]I.CS(C)=O>[CH3:29][S:30]([C:2]1[O:6][C:5]([CH2:7][N:8]2[C:16]3[C:11](=[CH:12][CH:13]=[CH:14][CH:15]=3)[C:10]3([C:20]4=[CH:21][C:22]5[O:26][CH2:25][O:24][C:23]=5[CH:27]=[C:19]4[O:18][CH2:17]3)[C:9]2=[O:28])=[CH:4][CH:3]=1)(=[O:32])=[O:31]

Participants

6

Reactant 3

HCID 145742L-ProlineHCID 2733271Sodium methanesulfinateHCID 592634371'-[(5-bromo-2-furyl)methyl]spiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-2'(1'H)-one

Product 1

HCID 592634181'-{[5-(methylsulfonyl)-2-furyl]methyl}spiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-2'(1'H)oneYield 71.6%

Reagents, catalysts & solvents 2

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 679Dimethyl SulfoxideSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 1′-[(5-bromo-2-furyl)methyl]spiro[furo[2,3-f][1,3]benzodioxole-7,3′-indol]-2′(1′H)-one (0.70 g, 1.59 mmol), sodium methanesulfinate (85%, 0.23 g, 1.91 mmol), copper (I) iodide (0.04 g, 0.22 mmol), L-proline (0.04 g, 0.35 mmol) and dimethyl sulfoxide (4.00 mL) was heated at 100° C. After 3 days, the reaction mixture was cooled down to ambient temperature, quenched with water (50.0 mL) and extracted with ethyl acetate (3×40.0 mL). The combined organic layers was washed with brine (2×50.0 mL), dried over sodium sulfate and filtered. The filtrate was concentrated in vacuo to dryness. The residue was subjected to column chromatography eluting with ethyl acetate:hexane (30-50%) to afford the title compound (0.50 g, 71%): mp 177-179° C.; 1H NMR (300 MHz, CDCl3) δ 7.29 (t, 1H), 7.19 (d, 1H), 7.12-7.04 (m, 2H), 6.94 (d, 1H), 6.50 (s, 1H), 6.42 (d, 1H), 6.11 (s, 1H), 5.86 (s, 2H), 5.00 (ABq, 2H), 4.79 (ABq, 2H), 3.11 (s, 3H); 13C NMR (75 MHz, CDCl3) δ 177.3, 155.9, 154.5, 149.1, 149.1, 142.4, 141.1, 131.9, 129.1, 124.2, 124.1, 119.0, 118.4, 109.9, 108.7, 102.9, 101.6, 93.7, 80.3, 58.2, 43.4, 37.2; MS (ES+) m/z 440.0 (M+1).

Workup

  1. temperaturethe reaction mixture was cooled down to ambient temperature
  2. customquenched with water (50.0 mL)
  3. extractionextracted with ethyl acetate (3×40.0 mL)
  4. washThe combined organic layers was washed with brine (2×50.0 mL)
  5. dry with materialdried over sodium sulfate
  6. filtrationfiltered
  7. concentrationThe filtrate was concentrated in vacuo to dryness
  8. washeluting with ethyl acetate

Sources & evidence

ORD record
ord-42aa865659424830bfdc7a85a2b0f967
Source dataset
uspto-grants-2010_04
Patent number
US07700641B2

Reaction notes

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