反应详情

A solution of 2,4-dichloro-5-(trifluromethyl)pyrimidine (166 mg, 0.766 mmol) in 1:1 DCE:t-BuOH (5 mL) was stirred at 0° C. under nitrogen. 1.0 M Zinc(II) chloride in ether (0.77 mL, 0.77 mmol) was added and the mixture stirred for one hour. tert-Butyl 4-(4-amino-3-ethylphenyl)piperidine-1-carboxylate (I40) (212 mg, 0.70 mmol) in 1:1 DCE:t-BuOH (5 mL) was added dropwise, and after 30 minutes triethylamine (146 μL, 1.05 mmol) in 1:1 DOE:t-BuOH (5 mL) was added and the mixture allowed to slowly come to room temperature. After 18 hours the mixture was concentrated, and chromatography (12 g silica cartridge, 0-50% ethyl acetateicyclohexane) gave the title compound (I41) (283 mg, 84% yield) as a pale pink solid; 1H NMR (400 MHz, CDCl3) δ 8.51 (d, J=0.6 Hz, 1H), 7.60 (d, J=8.3 Hz, 1H), 7.15-7.07 (m, 3H), 4.25 (s, 2H), 2.80 (t, J=12.1 Hz, 2H), 2.69-2.59 (m, 3H), 1.83 (d, J=12.9 Hz, 2H), 1.69-1.59 (m, 2H), 1.49 (s, 9H), 1.23 (t, J=7.6 Hz, 3H), LCMS Method C: rt. 6.94 min; m/z 429.1 [M-tBu+2H]+, 385.1 [M-Boc+2H]+; m/z 483.1 [M−H]−.

1. customto slowly come to room temperature
2. concentrationAfter 18 hours the mixture was concentrated