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周范(金币+2, 博学EPI+1): ★有帮助谢谢 2012-03-07 13:59:16
周范(金币+2): ★有帮助谢谢 2012-03-07 13:59:47
06233053(金币+4): 代发 2012-03-10 15:13:00

To 40 ml of an aqueous solution of 4.00 g (23.2 mmol) of ethyl 2-aminothiazole-4-carboxylate was added 1.86 g (46.5 mmol) of sodium hydroxide, followed by stirring at room temperature for 5 hours. The reaction liquid was adjusted to pH 1 by the addition of concentrated hydrochloric acid, and the precipitated crystals were collected by filtration to prepare 2.84 g (yield 85percent) of a target compound. 1H-NMR (CDCl3, ppm) δ 7.18 (2H, broad-s), 7.38 (1H, s). The proton of the carboxylic acid was not detected.
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