2,6-Di-tert-butylpyridine → Tert-butyl [1-benzyl-2-({2-chloro-6-[(methylsulfonyl)(propyl)amino]pyridin-4-yl}methoxy)-1-methylethyl]carbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl (1-benzyl-2-hydroxy-1-methylethyl)carbamate (250 mg, 0.94 mmol, intermediate IV) and N-[4-(bromomethyl)-6-chloropyridin-2-yl]-N-propylmethanesulfonamide (290 mg, 0.85 mmol) in dichloromethane (20 mL) was added silver triflate (290 mg, 1.13 mmol) and 2,6-ditertbutylpyridine polymer bound (1.84 g, 2.83 mmol, Aldrich 37, 782-1). The reaction mixture was stirred at 50° C. in an oil bath for 16 h and then irradiated under microwave (Smith Synthesizer) at 90° C. for 45, 60 and 90 min intervals (3 runs, with addition of additional silver triflate and 2,6-ditertbutylpyridine polymer bound before 2nd and 3rd run). The reaction mixture was filtered on celite, rinsed with dichloromethane, concentrated in vacuo and purified by flash chromatography (silica, 0-30% EtOAc/hexanes) to provide tert-butyl [1-benzyl-2-({2-chloro-6-[(methylsulfonyl)(propyl)amino]pyridin-4-yl}methoxy)-1-methylethyl]carbamate. 1H NMR (400 MHz, CDCl3) δ 7.34-7.16 (m, 7H), 4.56 (s, 2H), 4.50 (s, 1H), 3.83 (t, J=6.8 Hz, 2H), 3.66 (A of AB, d, J=9.2 Hz, 1H), 3.54 (B of AB, d, J=9.2 Hz, 1H), 3.15 (A of AB, d, J=13.2 Hz, 1H), 3.03 (s, 3H), 2.90 (B of AB, d, J=13.2 Hz, 1H), 1.64-1.50 (m, 2H), 1.47 (s, 9H), 1.26 (s, 3H), 0.92 (t, J=7.2 Hz, 3H).

Provenance & Evidence