反应详情

A portion of 4-(6-chloro-4-(ethoxycarbonyl)chroman-7-yloxy)benzoic acid (Preparation 1; 0.7 g, 1.86 mmol) was diluted with dichloromethane (1 mL) followed by the addition of oxalyl chloride in dichloromethane (1.02 ml, 2.04 mmol) and DMF (1 drop). After stirring for 10 minutes, 2-(2-methoxy-4-(trifluoromethyl)phenyl)ethanamine (Preparation 9; 0.448 g, 2.04 mmol) and DIEA (1.13 ml, 6.50 mmol) were added, and the reaction was stirred for 2 hours. The reaction was loaded directly onto a biotage 25 cartridge and eluted with 5% ethyl acetate/hexanes to 75% ethyl acetate/hexanes to yield ethyl 6-chloro-7-(4-(2-methoxy-4-(trifluoromethyl)phenethylcarbamoyl)phenoxy)chroman-4-carboxylate (624 mg, 1.08 mmol, 58.1% yield).

1. stirringthe reaction was stirred for 2 hours
2. washeluted with 5% ethyl acetate/hexanes to 75% ethyl acetate/hexanes