Diisopropylethylamine → HCID 59314384、化合物

2-Amino-indane-2-carboxylic acid ethyl ester (2) (250 mg, 1.2 mmol), 4-difluoromethoxy-2-methyl-benzoic acid (242) (246 mg, 1.2 mmol) and HATU (555 mg, 1.46 mmol) are taken in a vial, evacuated and refilled with nitrogen Anhydrous DMF (2 mL) is added and stirring is initiated. After few min, DIPEA (0.302 mL, 1.82 mmol) is added and stirred at RT overnight. Analysis by tlc of the reaction mixture (silica, 50% EtOAc/heptanes) indicates complete consumption of the starting amine. Water (10 mL) is added, extracted with EtOAc (3×5 mL), dried over Na2SO4, concentrated and the crude product is chromatographed on a 25 g silica gel column using 20-50% EtOAc in heptane as a gradient to afford 2-(4-difluoromethoxy-2-methyl-benzoylamino)-indan-2-carboxylic acid ethyl ester (415 mg, 89%).