反应详情

温度

0 °C

A solution of (Z)-3-iodoacrylic acid (1a) (2.75 g, 1.0 eq.) in CH2Cl2 (25.0 mL) was cooled to 0° C. and sequentially treated with DIPEA (1.96 g, 1.1 eq), HATU (5.78 g, 1.1 eq) and 3,3-difluoroazetidine hydrochloride (1.98 g, 1.1 eq). The reaction mixture was stirred at 0° C. for 2-3 hr before being filtered, and concentrated under reduced pressure affording 3.5 g of crude compound. Purification by column chromatography (silica gel, elution with EtOAc/hexane) afforded 1.89 g of pure desired compound. Yield (49.87%). Mass: (ES+) 273.8 (M+1).

1. filtrationbefore being filtered
2. concentrationconcentrated under reduced pressure
3. customaffording 3.5 g of crude compound
4. customPurification
5. washby column chromatography (silica gel, elution with EtOAc/hexane)