Diisopropylethylamine → ethyl 6-bromo-4-[[(2S)-2-methoxypropyl]amino]quinoline-3-carboxylate

Participants

Reaction Steps

Suspend ethyl-6-bromo-4-chloro-quinoline-3-carboxylate (389 g, 1.24 mol) and (2S)-2-methoxypropan-1-amine, hydrochloride (171 g, 1.36 mol, 1.1 eq.) in ethanol (5.84 L). Add diisopropylethylamine (474 mL) and heat the mixture at 50° C. overnight. After 16 hours, cool the reaction to room temperature and concentrate in vacuo. Add methyl tert-butyl ether (2 L) to the residue and stir for 20 min. Filter the precipitate and wash it with methyl tert-butyl ether (2×250 mL). Concentrate the filtrate in vacuo to afford the titled compound in almost quantitative yield. The compound will be used in the next step without further purification. MS (ESI) m/z (M+H)+ 367.0, 369.0.

Provenance & Evidence