Acetyl chloride → HCID 58033730, compound

Participants

Reaction Steps

At −78° C., acetyl chloride (1 ml, 12 mmol) was added to a solution of the amine (B3) (3.2 g, 10 mmol) in dry acetonitrile (100 ml) followed by the dropswise addition of triethylamine. The reaction mixture was warmed to room temperature, stirred for 1 hour then concentrated. The residue was dissolved in ethyl acetate. The solution was washed with saturated NaHCO3 and brine, dried and concentrated. The crude product was further purified by silica gel chromatography (CH2Cl2/CH3CN 9:1 to 7:3) to give (S)-tert-butyl 4-acetamido-3,4-dihydro-2H-spiro[naphthalene-1,4′-piperidine]-1′-carboxylate (B4). LC-MS: m/e=359.3 (M+H), 303.3 (M+H−Me3CO). Rt=2.94 min. 1H-NMR (500 MHz, DMSO-d6): 8.17 (d, 1H), 7.36 (d, 1H), 7.22 (ddd, 1H), 7.14 (m, 2H), 4.95 (m, 1H), 3.86 (m, 2H), 2.97 (m, 2H), 2.01 (m, 1H), 1.85 (s, 3H), 1.80 (m, 4H), 1.61 (m 2H), 1.48 (d, 1H), 1.42 (s, 9H).

Provenance & Evidence