Formaldehyde → methyl 2-{[3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-2-oxo-2,3-dihydro-1H-indol-1-yl]methyl}benzoate

HRID 545685Notes

Reaction equation

HRID 545685 reaction equation
[OH:1][C:2]1[C:3]([CH:11]2[C:19]3[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=3)[N:13]([CH2:20][C:21]3[CH:30]=[CH:29][CH:28]=[CH:27][C:22]=3[C:23]([O:25][CH3:26])=[O:24])[C:12]2=[O:31])=[CH:4][C:5]2[O:9][CH2:8][O:7][C:6]=2[CH:10]=1.[CH2:32]=[O:33].C([N-]C(C)C)(C)C.[Li+]>C1COCC1>[OH:1][C:2]1[C:3]([C:11]2([CH2:32][OH:33])[C:19]3[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=3)[N:13]([CH2:20][C:21]3[CH:30]=[CH:29][CH:28]=[CH:27][C:22]=3[C:23]([O:25][CH3:26])=[O:24])[C:12]2=[O:31])=[CH:4][C:5]2[O:9][CH2:8][O:7][C:6]=2[CH:10]=1

Participants

5

Reactant 3

HCID 712FormaldehydeHCID 2724682Lithium diisopropylamideHCID 12004245methyl 2-{[3-(6-hydroxy-1,3-benzodioxol-5-yl)-2-oxo-2,3-dihydro-1H-indol-1-yl]methyl}benzoate

Product 1

HCID 58872558methyl 2-{[3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-2-oxo-2,3-dihydro-1H-indol-1-yl]methyl}benzoateYield 76.5%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A solution of methyl 2-{[3-(6-hydroxy-1,3-benzodioxol-5-yl)-2-oxo-2,3-dihydro-1H-indol-1-yl]methyl}benzoate (17.1 g, 40.0 mmol) and paraformaldehyde (10.3 g, 330 mmol) in THF (500 mL) was degassed by bubbling through argon for 2 hours. To this solution was added lithium diisopropylamide solution (45.1 mL, 2 M solution, 90.0 mmol) slowly at −78° C. The mixture was stirred at ambient temperature overnight and quenched with saturated ammonium chloride solution. The mixture was concentrated in vacuo to remove THF followed by the addition of ethyl acetate (500 mL). The organic layer was washed with water, dried over sodium sulfate and filtered. The filtrate was concentrated in vacuo to dryness. The residue was recrystallized from ethyl acetate/hexanes to give the title compound (13.7 g, 75%): 1H NMR (300 MHz, DMSO-d6) δ 9.20 (s, 1H), 7.95 (dd, 1H), 7.53-7.33 (m, 3H), 7.08-6.82 (m, 4H), 6.53 (d, 1H), 6.25 (s, 1H), 5.93-5.86 (m, 2H), 5.31-5.07 (m, 3H), 4.26-4.17 (m, 1H), 4.00-3.92 (m, 1H), 3.88 (s, 3H); MS (ES+) m/z 448.3 (M+1).

Workup

  1. customby bubbling through argon for 2 hours
  2. customquenched with saturated ammonium chloride solution
  3. concentrationThe mixture was concentrated in vacuo
  4. customto remove THF
  5. additionfollowed by the addition of ethyl acetate (500 mL)
  6. washThe organic layer was washed with water
  7. dry with materialdried over sodium sulfate
  8. filtrationfiltered
  9. concentrationThe filtrate was concentrated in vacuo to dryness
  10. customThe residue was recrystallized from ethyl acetate/hexanes

Sources & evidence

ORD record
ord-333e1e7a88af4fb6a786c2aa4be75388
Source dataset
uspto-grants-2011_05
Patent number
US07935721B2

Reaction notes

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