Citric Acid → 2-(2-(3,5-Bis(trifluoromethyl)benzyloxy)-6,7,8,9-tetrahydropyrido[1,2-a]indol-9-yl)acetic Acid

HRID 1964166Notes

Reaction equation

HRID 1964166 reaction equation
[F:1][C:2]([F:35])([F:34])[C:3]1[CH:4]=[C:5]([CH:27]=[C:28]([C:30]([F:33])([F:32])[F:31])[CH:29]=1)[CH2:6][O:7][C:8]1[CH:9]=[C:10]2[C:14](=[CH:15][CH:16]=1)[N:13]1[CH2:17][CH2:18][CH2:19][CH:20]([CH2:21][C:22]([O:24]CC)=[O:23])[C:12]1=[CH:11]2.[Li+].[OH-].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>O1CCOCC1.O>[F:32][C:30]([F:31])([F:33])[C:28]1[CH:27]=[C:5]([CH:4]=[C:3]([C:2]([F:35])([F:34])[F:1])[CH:29]=1)[CH2:6][O:7][C:8]1[CH:9]=[C:10]2[C:14](=[CH:15][CH:16]=1)[N:13]1[CH2:17][CH2:18][CH2:19][CH:20]([CH2:21][C:22]([OH:24])=[O:23])[C:12]1=[CH:11]2

Participants

6

Reactant 3

HCID 311Citric AcidHCID 3939Lithium HydroxideHCID 86654875Ethyl 2-(2-(3,5-Bis(trifluoromethyl)benzyloxy)-6,7,8,9-tetrahydropyrido[1,2-a]indol-9-yl)acetate

Product 1

HCID 583295792-(2-(3,5-Bis(trifluoromethyl)benzyloxy)-6,7,8,9-tetrahydropyrido[1,2-a]indol-9-yl)acetic AcidYield 91.4%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Procedure

To a solution of ethyl 2-(2-(3,5-bis(trifluoromethyl)benzyloxy)-6,7,8,9-tetrahydropyrido[1,2-a]indol-9-yl)acetate (145 mg, 0.29 mmol) in dioxane (1.5 mL) was added 1 M LiOH aqueous solution (1.16 mL, 1.161 mmol). The reaction was stirred at room temperature for 8 h, diluted with water, and acidified to pH 4 with 0.5 M aqueous citric acid. The solid precipitate was collected to give the title compound (125 mg). LCMS m/z=471.8 [M+H]+; 1H NMR (400 MHz, CDCl3) δ ppm 1.55-1.65 (m, 1H), 2.00-2.10 (m, 1H), 2.17-2.26 (m, 2H), 2.65 (dd, J=16.1, 8.5 Hz, 1H), 3.00 (dd, J=16.1, 5.4 Hz, 1H), 3.45-3.54 (m, 1H), 3.85-3.94 (m, 1H), 4.14-4.22 (m, 1H), 5.19 (s, 2H), 6.23 (s, 1H), 6.91 (dd, J=8.8, 2.4 Hz, 1H), 7.09 (d, J=2.4 Hz, 1H), 7.19 (d, J=8.7 Hz, 1H), 7.83 (s, 1H), 7.94 (s, 2H).

Workup

  1. customThe solid precipitate was collected

Sources & evidence

ORD record
ord-0b1c046b689e48efb08c29726e7796bd
Source dataset
uspto-grants-2013_04
Patent number
US08415484B2

Reaction notes

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