2-amino-1-(3-bromophenyl)ethanone;hydrochloride

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The 2-amino-1-(3-bromophenyl)ethanone hydrochloride (4.6 g, 19 mmol), HO2CC(OEt)2CH2Br (5.0 g, 21 mmol), and NMM (12.5 mL, 113 mmol) were suspended in anhyd THF (270 mL) under N2 and PyBOP (10.8 g, 21 mmol) was added in one portion. The reaction mixture was stirred for 18 h and concentrated to ¼ vol and the precipitates were removed by filtration (HCl salt of NMM). The mother liquor was taken up in dichloromethane and washed with water. After concentration, the crude residue was subjected to flash chromatography (silica gel) eluting with 60% EtOAc/hexanes to give Intermediate J.1, 5.3 g (65%). 1H NMR (500 MHz, DMSO-d6): δ 8.27 (t, J=5.5 Hz, 1H), 8.14 (t, J=1.5 Hz, 1H), 8.00 (dt, J=7.9, 1.2 Hz, 1H), 7.87 (dd, J=8.8, 1.8 Hz, 1H), 7.51 (t, J=7.9 Hz, 1H), 4.65 (d, J=5.8 Hz, 2H), 3.67 (s, 2H) 3.58-3.46 (m, 4H), 1.18 (t, J=7.0 Hz, 6H). LCMS: 2.2 min; LRMS: Calcd. for C15H19Br2NO4: 435.98. Found: 435.98 (M+H)+. concentrated the precipitates were removed by filtration (HCl salt of NMM) washed with water After concentration eluting with 60% EtOAc/hexanes to give Intermediate J.1, 5.3 g (65%) 2.2 min