Cesium carbonate → HCID 67220693, compound

Participants

Reaction Steps

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).

Provenance & Evidence