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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 1259561
Notes
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Reaction equation

HRID 1259561 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
ParticipantsProcedureWorkupSources & evidenceReaction notes

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 8028
Tetrahydrofuran
Solvent

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-d18f55c87bbc4f27844b970f0bf45939
Source dataset
uspto-grants-2013_06
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08466188B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes