Hydrochloric Acid → Ammonium Hydroxide

Participants

Reaction Steps

To a refluxing solution of lithium iodide (0.218 g, 1.626 mmol) in 2,6-lutidine (5 mL) is added 2,6-dimethyl-4-(5-chloro-3-methyl-2-pyridin-3-yl-indol-1-ylmethyl)-benzoic acid ethyl ester (0.176 g, 0.407 mmol). The reaction is refluxed overnight. It is cooled to room temperature, acidified to pH 1 using 1M aqueous HCl solution and extracted with dichloromethane. The organic layer is dried over sodium sulfate and concentrated in vacuo. The residue is purified by reverse phase HPLC with Xbridge Shield RP18 column and a 0.1% aqueous NH4OH in acetonitrile gradient to afford 2,6-dimethyl-4-(5-chloro-3-methyl-2-pyridin-3-yl-indol-1-ylmethyl)-benzoic acid as a solid. 1H NMR (400 MHz, MeOD) δ ppm 2.22 (s, 6H), 2.28 (s, 3H), 5.22 (s, 2H), 6.49 (s, 2H), 7.15 (dd, J=8.6, 2.0 Hz, 1H), 7.30 (d, J=8.8 Hz, 1H), 7.51-7.57 (m, 1H), 7.61 (d, J=1.8 Hz, 1H), 7.81 (dt, J=8.1, 2.0, 1.8 Hz, 1H), 8.58 (d, J=1.3 Hz, 1H), 8.61 (dd, J=4.9, 1.6 Hz, 1H). HRMS (ESI) m/z 405.1379 [(M+H)+ Calcd for C24H21ClN2O2: 405.1370].

Provenance & Evidence