反应详情

温度

0 °C

2-[4-(4-Bromophenyl)-1,3-thiazol-2-ylamino]-3-hydroxy-propionic acid methyl ester (1.1 g, 3.08 mmol), prepared in the previous step, was dissolved in 40 mL of methylene chloride and triethylamine (4.3 mL, 30.8 mmol) was added. The mixture was cooled to 0° C. and triphosgene (2.3 g, 7.7 mmol) was added. The mixture was stirred for 1 h and then diluted with methylene chloride, washed with saturated NaHCO3, water, and brine, dried over anhydrous MgSO4, filtered and concentrated under reduced pressure. Flash chromatography (gradient 2% acetone/hexane to 15% acetone/hexane) afforded the title compound (510 mg, 44%) as a white solid. mp 165-167° C. HRMS: calcd for C14H, BrN2O4S+H+, 382.96956; found (ESI, [M+H]+), 382.9718. Analytical HPLC: retention time 9.9 min, 210-370 nm the Xterra® RP18 column, 3.5μ, 150×4.6 mm 40° C. 85/15-5/95 (Ammon. Form. Buff. pH=3.5/ACN+MeOH) for 10 min, hold 4 min, 1.2 mL/min 5 μL injection.

1. washwashed with saturated NaHCO3, water, and brine
2. dry with materialdried over anhydrous MgSO4
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure