1,2-Dichloroethane → 1-[6-(4-tert-Butyl-cyclohexyloxy)-naphthalen-2-ylmethyl]-piperidine-2-carboxylic acid

Participants

Reaction Steps

Piperidine-2-carboxylic acid (0.125 g, 0.967 mmol) as HCl salt was combined with 6-(4-tert-Butyl-cyclohexyloxy)-naphthalene-2-carbaldehyde (0.250 g, 0.805 mmol) in 1,2-dichloroethane (5 mL, 60 mmol) and acetic acid (0.500 mL, 8.79 mmol). The mixture was heated to reflux while stirring overnight. Reaction cooled to room temperature and then sodium triacetoxyborohydride (546 mg, 2.58 mmol) was added in small portions. The reaction was then left stirring overnight. Reaction was then purified directly via reverse phase chromatography (5-95% CH3CN/Water (0.1% TFA), C18, 150 mm). The product was then lyophilized to dryness to give 3 mg 1-[6-(4-tert-Butyl-cyclohexyloxy)-naphthalen-2-ylmethyl]-piperidine-2-carboxylic acid as a yellow solid (0.8%). ESI-LCMS (424 M+H). 1H NMR (DMSO-d6, 400 MHz): δ (ppm) 12.34-12.58 (m, 1H), 11.20-11.53 (m, 1H), 8.01 (s, 1H), 7.68-7.93 (m, 3H), 7.41 (s, 1H), 7.02-7.22 (m, 1H), 4.35 (br. s., 3H), 3.23-3.43 (m, 2H), 2.86-3.09 (m, 2H), 1.74-2.30 (m, 8H), 1.00-1.52 (m, 5H), 0.87 (s, 9H)

Provenance & Evidence