Hydrochloric Acid → 2-(7-(3,4-Diethoxybenzyloxy)-2,3-dihydro-1H-pyrrolo[1,2-a]indol-1-yl)acetic Acid

HRID 515726Notes

Reaction equation

HRID 515726 reaction equation
[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([CH:29]=[CH:30][C:31]=1[O:32][CH2:33][CH3:34])[CH2:7][O:8][C:9]1[CH:17]=[CH:16][C:15]2[N:14]3[CH2:18][CH2:19][CH:20]([CH2:21][C:22]([O:24]C(C)(C)C)=[O:23])[C:13]3=[CH:12][C:11]=2[CH:10]=1)[CH3:2].[Li+].[OH-].CCOC(C)=O.Cl>O1CCOCC1>[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([CH:29]=[CH:30][C:31]=1[O:32][CH2:33][CH3:34])[CH2:7][O:8][C:9]1[CH:17]=[CH:16][C:15]2[N:14]3[CH2:18][CH2:19][CH:20]([CH2:21][C:22]([OH:24])=[O:23])[C:13]3=[CH:12][C:11]=2[CH:10]=1)[CH3:2]

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 3939Lithium HydroxideHCID 8857Ethyl AcetateHCID 86654874tert-Butyl 2-(7-(3,4-Diethoxybenzyloxy)-2,3-dihydro-1H-pyrrolo[1,2-a]indol-1-yl)acetate

Product 1

HCID 583295752-(7-(3,4-Diethoxybenzyloxy)-2,3-dihydro-1H-pyrrolo[1,2-a]indol-1-yl)acetic AcidYield 86.3%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Conditions

Temperature
70 °C

Procedure

tert-Butyl 2-(7-(3,4-diethoxybenzyloxy)-2,3-dihydro-1H-pyrrolo[1,2-a]indol-1-yl)acetate (173.1 mg) was taken up in dioxane (4 mL) and 1.0 M aqueous LiOH (1.11 mL) was added. The reaction was stirred at 70° C. 16 h, and stirred at 80° C. for an additional 5 h. The mixture was cooled to room temperature and poured into a separatory funnel containing EtOAc and 1.0 M HCl. The water layer was removed and the EtOAc layer was washed with water. The organics were dried over sodium sulfate, filtered, and concentrated under reduced pressure to give title compound (131.4 mg). LCMS m/z=410.4 [M+H]+; 1H NMR (400 MHz, CDCl3) δ ppm 1.28-1.34 (m, 6H), 2.15-2.26 (m, 1H), 2.54 (dd, J=16.3, 7.9 Hz, 1H), 2.68 (dd, J=16.3, 6.7 Hz, 1H), 2.72-2.82 (m, 1H), 3.53-3.62 (m, 1H), 3.91-4.93 (m, 6H), 4.95 (s, 2H), 6.0 (s, 1H), 6.73 (dd, J=8.7, 2.4 Hz, 1H), 6.90-6.96 (m, 2H), 7.02-7.06 (m, 2H), 7.17 (d, J=9.0 Hz, 1H), 12.3 (bs, 1H).

Workup

  1. stirring16 h, and stirred at 80° C. for an additional 5 h
  2. temperatureThe mixture was cooled to room temperature
  3. additionpoured into a separatory funnel
  4. customThe water layer was removed
  5. washthe EtOAc layer was washed with water
  6. dry with materialThe organics were dried over sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-51790a770c554f9a82fe233099733bb4
Source dataset
uspto-grants-2015_08
Patent number
US09108969B2

Reaction notes

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