Cesium carbonate → HCID 67220693, compound

HRID 2040529Notes

Reaction equation

HRID 2040529 reaction equation
[OH:1][C:2]1[CH:10]=[CH:9][C:8]2[NH:7][C:6]3[CH:11]([CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])[CH2:12][CH2:13][C:5]=3[C:4]=2[CH:3]=1.C(=O)([O-])[O-].[Cs+].[Cs+].Br[CH2:27][C:28]1[CH:33]=[N:32][C:31]([O:34][CH:35]([CH3:37])[CH3:36])=[CH:30][N:29]=1>CN(C=O)C>[CH:35]([O:34][C:31]1[N:32]=[CH:33][C:28]([CH2:27][O:1][C:2]2[CH:10]=[CH:9][C:8]3[NH:7][C:6]4[CH:11]([CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])[CH2:12][CH2:13][C:5]=4[C:4]=3[CH:3]=2)=[N:29][CH:30]=1)([CH3:37])[CH3:36]

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 53345675Ethyl 2-(7-hydroxy-1,2,3,4-tetrahydrocyclopenta[b]indol-3-yl)acetateHCID 67220392HCID 67220392, compound

Product 1

HCID 67220693HCID 67220693, compoundYield 19.9%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent2×

Procedure

Ethyl 2-(7-hydroxy-1,2,3,4-tetrahydrocyclopenta[b]indol-3-yl)acetate (0.035 g, 0.135 mmol) and cesium carbonate (0.048 g, 0.148 mmol) were dissolved in DMF (0.5 mL) and stirred at room temperature for 5 min. To this mixture at 0° C. was added a solution of 2-(bromomethyl)-5-isopropoxypyrazine (0.034 g, 0.148 mmol) in DMF (0.20 mL) and was stirred at room temperature for 60 h. The solids were removed by filtration. The filtrate was purified by HPLC to give ethyl 2-(7-((5-isopropoxypyrazin-2-yl)methoxy)-1,2,3,4-tetrahydrocyclopenta[b]indol-3-yl)acetate (11 mg). To the ester dissolved in dioxane (288 μL) was added aqueous LiOH (1 N, 72 μL). The mixture was stirred at room temperature for 16 h; before more aqueous LiOH (1 N, 200 μL) was added. Stirring was continued for 1 h. To the reaction mixture was added water (1.5 mL) and the reaction mixture was acidified to pH 3 with 1 N HCl. The mixture was purified by HPLC to give the title compound as a yellow solid (7 mg). LCMS m/z=382.4 [M+H]+; 1H NMR (500 MHz, CDCl3) δ ppm 1.32 (d, J=6.31 Hz, 6H), 1.95-2.18 (m, 1H), 2.28-2.41 (m, 1H), 2.56-2.79 (m, 4H), 3.36-3.56 (m, 1H), 5.09 (s, 2H), 5.15-5.33 (m, 1H), 6.71 (d, J=8.83 Hz, 1H), 6.94 (s, 1H), 7.20 (d, J=8.83 Hz, 1H), 8.20 (s, 1H), 8.30 (s, 1H), 10.37 (s, 1H).

Workup

  1. stirringwas stirred at room temperature for 60 h
  2. customThe solids were removed by filtration
  3. customThe filtrate was purified by HPLC

Sources & evidence

ORD record
ord-fbb68fa46c7549758641cebd1a276620
Source dataset
uspto-grants-2013_11
Patent number
US08580841B2

Reaction notes

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