反应详情

A solution of 2.0 g (12 mmol) of 2-isopropyl-4-(hydroxyethyl)thiazole in 50 ml of tetrahydrofuran was treated with 1.34 g (12 mmol) of methanesulfonyl chloride. The resulting solution was treated dropwise with 3.4 ml (24 mmol) of triethylamine and stirred at ambient temperature for 1 h. A portion (25 ml) of the resulting solution was added to 50 ml of aqueous ethylamine (70% in H2O) with rapid stirring. After addition, the mixture was heated to reflux for 2 h, allowed to cool, diluted with ethyl acetate, washed with aqueous NaHCO3 and saturated brine, dried over Na2SO4, and concentrated in vacuo to provide the crude desired compound. Purification of the residue by silica gel chromatography using 5% methanol in chloroform, 0.52 g (48%) of the desired compound. 1H NMR (CDCl3) δ 1.38 (d, J=7 Hz, 3 H), 2.46 (s, 3 H), 2.93 (s, 4 H), 3.30 (heptet, J=7 Hz, 1 H), 6.79 (s, 1 H). Mass spectrum: (M+H)+ =185.

1. additionAfter addition
2. temperaturethe mixture was heated
3. temperatureto reflux for 2 h
4. temperatureto cool
5. washwashed with aqueous NaHCO3 and saturated brine
6. dry with materialdried over Na2SO4
7. concentrationconcentrated in vacuo