Toluene → HCID 58215614, compound

Participants

Reaction Steps

To a solution of 2-pyridin-3-yl-1H-indole-5-carbonitrile (Example 8, 210 mg, 1.37 mmol) in THF (20 mL) at room temperature is added 0.5 M KHMDS in toluene (4.1 mL, 2.05 mmol). After 30 min, chloromethyl pivalate (510 mg, 3.08 mmol) is added. The mixture is stirred under N2 for 1 h. Saturated aqueous sodium bicarbonate (0.5 mL) is added to quench the reaction. Silica gel is added to the mixture and the solvents are removed in vacuo. The residue is purified by silica gel flash chromatography (ethyl acetate-heptane, 0:1 to 1:0). Further purification by HPLC using an Xbridge RP18 with a gradient of 0.1% aqueous ammonium hydroxide in acetonitrile gives 2,2-dimethyl-propionic acid 5-cyano-2-pyridin-3-yl-indol-1-ylmethyl ester as a white solid. 1H NMR (400 MHz, CDCl3) δ ppm 1.20 (s, 9H), 6.08 (s, 2H), 6.77 (s, 1H), 7.49 (ddd, J=7.8, 4.8, 0.8 Hz, 1H), 7.56 (dd, J=8.6, 1.8 Hz, 1H), 7.68 (d, J=8.6 Hz, 1H), 7.94 (ddd, J=7.9, 2.0 Hz, 1H), 8.01 (dd, J=1.5, 0.5 Hz, 1H), 8.75 (dd, J=4.8, 1.8 Hz, 1H), 8.87 (d, J=1.5 Hz, 1H). HRMS (ESI) m/z 334.1566 [(M+H)+ Calcd for C20H20N3O2: 334.1556].

Provenance & Evidence