Triphenylphosphine → N-[(4-{4-[(1-ethylpiperidin-4-yl)oxy]phenyl}tetrahydro-2H-pyran-4-yl)methyl]pyridin-2-amine

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To a solution of 4-{4-[(pyridin-2-ylamino)methyl]tetrahydro-2H-pyran-4-yl}phenol (250 mg, 0.881 mmol), 1-ethylpiperidin-4-ol (103 mg, 0.8 mmol) and triphenylphosphine (231 mg, 0.881 mmol) in THF (5 ml) at 0° C. under nitrogen was added dropwise diisopropyl azodicarboxylate (95% solution, 183 μl, 0.881 mmol). Reaction was stirred for 10 minutes then warmed to room temperature for 72 hours until complete. THF was removed in vacuo and the residue partitioned between ethyl acetate (50 ml) and saturated sodium bicarbonate solution (50 ml). The organic layer was separated, dried over sodium sulphate, filtered and concentrated in vacuo. Crude product was purified by flash chromatography eluting with dichloromethane:methanol:ammonia (100:0:0 to 96:4:0.4 by volume) to give the title compound (8.2 mg, 23%) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 1.05 (t, 3H), 1.80-1.98 (m, 4H), 2.00-2.18 (m, 4H), 2.28-2.42 (m, 2H), 2.44-2.54 (q, 2H), 2.72-2.86 (m, 2H), 3.50 (d, 2H), 3.55-3.62 (m, 2H), 3.78-3.88 (m, 2H), 4.00-4.08 (m, 1H), 4.30-4.39 (m, 1H), 6.22 (d, 1H), 6.50 (t, 1H), 6.90 (d, 2H), 7.23 (d, 2H), 7.30 (t, 1H), 8.01 (d, 1H). LRMS APCI+ m/z 396 [MH]+. HRMS ESI+ m/z 396.2641 [MH]+.

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