Formic Acid → (S)-7-[(1,3-Dihydro-1,3-dioxo-2H-isoindol-2-yl)]-1,2,3,4,6,7,8,12b-octahydro-6-oxopyrido[2,1-a][2]benzazepine-4-carboxylic acid

HRID 342900Notes

Reaction equation

HRID 342900 reaction equation
[O:1]=[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:11])[N:3]1[C@H:12]1[CH2:18][C:17]2[CH:19]=[CH:20][CH:21]=[CH:22][C:16]=2[CH:15]2[CH2:23][CH2:24][CH:25]=[CH:26][N:14]2[C:13]1=[O:27].S(=O)(=O)(O)O.[CH:33]([OH:35])=[O:34]>C(OCC)(=O)C.CCCCCC.C(O)(=O)C>[O:1]=[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:11])[N:3]1[CH:12]1[CH2:18][C:17]2[CH:19]=[CH:20][CH:21]=[CH:22][C:16]=2[CH:15]2[CH2:23][CH2:24][CH2:25][C@@H:26]([C:33]([OH:35])=[O:34])[N:14]2[C:13]1=[O:27]

Participants

5

Reactant 3

HCID 284Formic AcidHCID 1118Sulfuric AcidHCID 9863597(S)-7-[(1,3-Dihydro-1,3-dioxo-2H-isoindol-2-yl)]-1,2,6,7,8,12b-hexahydro-6-oxopyrido[2,1-a][2]benzazepine

Product 1

HCID 22874156(S)-7-[(1,3-Dihydro-1,3-dioxo-2H-isoindol-2-yl)]-1,2,3,4,6,7,8,12b-octahydro-6-oxopyrido[2,1-a][2]benzazepine-4-carboxylic acid

Reagents, catalysts & solvents 1

HCID 21901998Ethyl acetate hexane acetic acidSolvent

Procedure

Combine (S)-7-[(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)]-1,2,6,7,8,12b-hexahydro-6-oxopyrido[2,1-a][2]benzazepine (67 mg, 0.19 mmol) and sulfuric acid (2.0 mL, 95-98%) in a pressure vessel. Add 96% formic acid (400 μL) and quickly seal the vessel. After 18 hours, open the vessel cautiously and add ice-cold water (5 mL). Extract the reaction mixture repeatedly with chloroform. Combine the organic layers, dry over MgSO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluting with 2/1/0.01 ethyl acetate/hexane/acetic acid to give the title compound.

Workup

  1. customquickly seal the vessel
  2. extractionExtract the reaction mixture repeatedly with chloroform
  3. dry with materialdry over MgSO4
  4. filtrationfilter
  5. customevaporate in vacuo
  6. customto give a residue

Sources & evidence

ORD record
ord-48f7c777eb034b3f83a4bd67a79e22d9
Source dataset
uspto-grants-1999_01
Patent number
US05859252

Reaction notes

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