Hydrochloric Acid → HCID 10277798, compound

Participants

Reaction Steps

The carboxylic acid obtained in Example 1 (12.2 g, 0.026 mol) was diluted with dichloromethane (150 mL) and oxalyl chloride (16.5 g, 0.13 mol). N,N-Dimethylformamide was added as a catalyst. The solution was stirred at room temperature for 14 hours, at which time the solvent was concentrated in vacuo. The crude acid chloride was triturated with hexane and collected by filtration. The solid was diluted with tetrahydrofuran (75 mL) and added dropwise to a mixture of hydroxylamine hydrochloride (9 g, 0.13 mol) and sodium bicarbonate (16.4 g, 0.19 mol) in tetrahydrofuran (150 mL)/water (75 mL) cooled to 0° C. The reaction mixture gradually warmed to room temperature and was stirred for 14 hours. Ethyl acetate and aq. HCl (1M) were added, the layers were separated, and the organic portion was washed with brine, dried (MgSO4), and concentrated. The resulting viscous liquid yielded a white solid (11.4 g, 90%) upon treatment with cold diethyl ether/petroleum ether (4:1), mp 190-192° C.; 1HNMR (DMSO-d6) δ 10.7 (s, 1H), 8.9 (s, 1H), 4.1 (s, 1H), 4.0 (m, 1H), 3.8 (m, 1H), 2.9 (m, 1H), 2.5 (m, 1H), 1.4, (s, 3H), 1.1 (s, 3H) ppm.

Provenance & Evidence