Oxalic Acid → HCID 86750001, compound

HRID 481630Notes

Reaction equation

HRID 481630 reaction equation
Cl[CH2:2][CH2:3][CH2:4][O:5][C:6]1[CH:14]=[CH:13][CH:12]=[C:11]2[C:7]=1[CH:8]=[CH:9][NH:10]2.[NH:15]1[CH2:20][CH2:19][C:18]2([CH2:25][C:24]3[CH:26]=[CH:27][CH:28]=[CH:29][C:23]=3[CH2:22][O:21]2)[CH2:17][CH2:16]1.C(=O)([O-])[O-].[K+].[K+].[C:36]([OH:41])(=[O:40])[C:37]([OH:39])=[O:38]>C(#N)C.C(OCC)(=O)C>[C:36]([OH:41])(=[O:40])[C:37]([OH:39])=[O:38].[NH:10]1[C:11]2[C:7](=[C:6]([O:5][CH2:4][CH2:3][CH2:2][N:15]3[CH2:20][CH2:19][C:18]4([CH2:25][C:24]5[CH:26]=[CH:27][CH:28]=[CH:29][C:23]=5[CH2:22][O:21]4)[CH2:17][CH2:16]3)[CH:14]=[CH:13][CH:12]=2)[CH:8]=[CH:9]1

Participants

7

Reactant 4

HCID 971Oxalic AcidHCID 11430Potassium CarbonateHCID 116941694-(3-chloropropoxy)-1H-indoleHCID 15187047HCID 15187047, compound

Product 1

HCID 86750001HCID 86750001, compound

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent2×

Procedure

A solution of 1-chloro-3-(4-indolyloxy)propane, 1,4-dihydrospiro[3H-2-benzopyran-3,4'-piperidine] and 3 equivalents of potassium carbonate in acetonitrile was heated at reflux for 12 h. The mixture was cooled, diluted with ethyl acetate, and the organic layer was separated and washed with brine. The crude residue was purified by silica gel chromatography (dichloromethane/5% methanol in dichloromethane gradient eluent). The resulting free base was dissolved in ethyl acetate and precipitated with one equivalent of oxalic acid in ethyl acetate, to give the title compound in 62% overall yield . FDMS m/e=376 (M+ of free base).

Workup

  1. temperatureat reflux for 12 h
  2. temperatureThe mixture was cooled
  3. customthe organic layer was separated
  4. washwashed with brine
  5. customThe crude residue was purified by silica gel chromatography (dichloromethane/5% methanol in dichloromethane gradient eluent)
  6. dissolutionThe resulting free base was dissolved in ethyl acetate

Sources & evidence

ORD record
ord-ac56297c552a4f18bb4b6f70c3fcb238
Source dataset
uspto-grants-1998_08
Patent number
US05789402

Reaction notes

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