Thionyl Chloride → HCID 86594960, compound

Participants

Reaction Steps

4-Iodo-2-nitrobenzoic acid piperidine amide. A suspension of 4-iodo-2-nitrobenzoic acid (1.0 g, 3.4 mmol) in thionyl chloride (10 mL) was heated to reflux for 45 min. The reaction mixture became homogeneous. The mixture was cooled and concentrated in vacuo to give 4-iodo-2-nitrobenzoyl chloride as a yellow oil, which was used immediately in the following reaction. 1H NMR (500 MHz, CDCl3): 8.38 (d, J=1.6 Hz, 1H), 8.12 (dd, J=8.1, 1.6 Hz, 1H), 7.48 (d, J=8.1 Hz, 1H). To a solution of 4-iodo-2-nitrobenzoyl chloride (3.4 mmol) in DCM (10 mL) at ambient temperature was added piperidine (1.3 mL, 13.1 mmol). The reaction mixture was stirred for 0.5 h then poured into 1 N HCl and extracted with DCM (2×). The combined organic extracts were dried (Na2SO4), and concentrated in vacuo affording the title amide as a white solid (1.2 g, 98%). MS (ESI): m/z 361 [M+H]+, 383 [M+Na]+. 1H NMR (400 MHz, CDCl3): (rotameric broadening) 8.51 (d, J=1.6 Hz, 1H), 8.01 (dd, J=8.0, 1.6 Hz, 1H), 7.12 (d, J=8.0 Hz, 1H), 3.85–3.65 (bm, 2H), 3.16 (t, J=5.6 Hz, 2H), 1.90–1.35 (bm, 6H).

Provenance & Evidence