Acetic Acid → HCID 86611447, compound

Participants

Reaction Steps

To the solution of ethyl 3-(4-bromophenyl)-3-oxopropanoate in THF (prepared in step A above), add acetic acid (160 L) and water (73 L) at an internal temperature of 8° C. To this mixture, add a solution of sodium nitrite (6.35 kg, 92.00 mol, 1.25 eq) in water (30 L) at an internal temperature of 6 to 9° C. during 90 min and stir at this temperature for 90 min. At an internal temperature of 4 to 7° C., add water (147 L) over 30 min to the reaction mixture and stir the resulting suspension for 30 min. Filter the suspension and wash the filter cake with water (59 L) and heptane (60 L). Dry the filter cake under a constant flow of nitrogen for 13 h to obtain the title compound: 18.731 kg according to loss of drying (23.044 kg wet); white powder; 1H NMR (DMSO-d6, 500.0 MHz): δ 1.22 (t, J=7.1 Hz, 3H), 4.27 (q, J=7.1 Hz, 2H), 7.75 (d, J=8.8 Hz, 2H, 7.83 (d, J=8.8 Hz, 2H), 13.18 (s, 1H); 13C NMR (DMSO-d6, 125.7 MHz): δ 14.36, 62.27, 129.68, 131.09, 133.08, 133.36, 148.44, 161.17, 191.08; Anal. Calcd for C11H10BrNO4: C, 44.02; H, 3.36; Br, 26.63; N, 4.67; O, 21.32. Found: C, 43.98; H, 3.31; Br, 26.65; N, 4.59; MS (ES−) 299; IR (KBr): 3281, 3219, 3049, 2983, 2870, 1728, 1680, 1586, 1446, 1400, 1302, 1262, 1029, 944 cm−1.

Provenance & Evidence