反应详情

A solution of Pd(Amphos)2Cl2 (1.188 g, 1.678 mmol), ethyl crotonate (5.01 ml, 40.3 mmol), 4-bromo-2-iodoaniline (Spectrum Bioscience, 10.000 g, 33.6 mmol), and n,n-diisopropylethylamine (7.03 ml, 40.3 mmol) in 6 mL DMF was heated to 90° C. for 6 hours. The reaction mixture was then poured into water and was extracted with DCM. The organics were dried over MgSO4 and concentrated. Purification of the crude residue by silica gel column chromatography (0-100% EtOAc/heptane) gave (Z)-ethyl 3-(2-amino-5-bromophenyl)but-2-enoate (3.817 g, 13.43 mmol, 40.0% yield) with minor impurities. m/z (ESI) 286.1 (M+H)+.

1. extractionwas extracted with DCM
2. dry with materialThe organics were dried over MgSO4
3. concentrationconcentrated
4. customPurification of the crude residue by silica gel column chromatography (0-100% EtOAc/heptane)