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Formaldehyde → 1-Ethyl-4-hydroxy-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic Acid Methyl Ester

HRID 1253290
Notes
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Reaction equation

HRID 1253290 reaction equation
[CH3:1][O:2][C:3](=[O:21])[CH2:4][C:5]1([CH2:19][CH3:20])[C:10]2[NH:11][C:12]3[C:17]([C:9]=2[CH:8](N)[CH2:7][O:6]1)=[CH:16][CH:15]=[CH:14][CH:13]=3.[OH2:22].C=O>C1COCC1>[CH3:1][O:2][C:3](=[O:21])[CH2:4][C:5]1([CH2:19][CH3:20])[C:10]2[NH:11][C:12]3[C:17]([C:9]=2[CH:8]([OH:22])[CH2:7][O:6]1)=[CH:16][CH:15]=[CH:14][CH:13]=3
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 712FormaldehydeHCID 962WaterHCID 543235014-Amino-1-ethyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid methyl ester

Product 1

HCID 140647231-Ethyl-4-hydroxy-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic Acid Methyl EsterYield 66.4%

Reagents, catalysts & solvents 1

HCID 8028Tetrahydrofuran
Solvent

Procedure

To a solution of 4-amino-1-ethyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid methyl ester (6 g, 0.020 mol) in 50 mL THF was added 50 mL of H2O and paraformaldehyde (5 g) and the solution was heated at reflux for 2 hours under nitrogen. It was then cooled, concentrated in vacuo, and diluted with ethyl acetate. The ethyl acetate layer was washed with saturated sodium bicarbonate solution, brine, dried and concentrated in vacuo. The residue was purified by flash chromatography eluting with hexane to give a white solid (4 g, 66.4%) m.p. 86°-90° C.

Workup

  1. temperaturethe solution was heated
  2. temperatureat reflux for 2 hours under nitrogen
  3. temperatureIt was then cooled
  4. concentrationconcentrated in vacuo
  5. additiondiluted with ethyl acetate
  6. washThe ethyl acetate layer was washed with saturated sodium bicarbonate solution, brine
  7. customdried
  8. concentrationconcentrated in vacuo
  9. customThe residue was purified by flash chromatography
  10. washeluting with hexane

Sources & evidence

ORD record
ord-a6f2e00990214c2d94735a35b65b7d4c
Source dataset
uspto-grants-1988_05
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US04748252

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes