2-Fluoro-N-methoxy-N-methylnicotinamide → Tert-butyl 4-(5-(2-fluoronicotinoyl)thiazol-2-yl)-1,4-diazepane-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A 2.5M n-butyl lithium in tetrahydrofuran solution (0.9 ml, 2.25 mmol) was added dropwise to a solution of tert-butyl-4-(thiazol-2-yl)-1,4-diazepane-1-carboxylate (570 mg, 2 mmol) in tetrahydrofuran (7 ml), cooled to −78° C. Thirty minutes later, a solution of 2-fluoro-N-methoxy-N-methylnicotinamide (370 mg, 2 mmol) in tetrahydrofuran (2 ml) added dropwise. The reaction mixture was stirred at −78° C. for one hour, then at 0° C. for an extra hour. It was quenched with a saturated sodium bicarbonate aqueous solution. The reaction mixture was diluted with ethyl acetate, then washed with brine. The organic was dried over magnesium sulfate, then concentrated in vacuo. The residue was purified by flash chromatography (40 g silica gel, pentane/ethyl acetate) to afford the title compound (300 mg, 38%). 1H NMR (CD3OD): 1.42 (9H, s), 1.90-2.00 (2H, MO, 3.45-3.50 (2H, m)<3.65-6.75 (2H, m), 3.80-3.90 (2H, m), 7.46-7.49 (1H, t), 7.67-7.69 (1H, d), 8.10-8.15 (1H, t), 8.39-8.40 (1H, d). MS (ES+): 407.

Provenance & Evidence