反应详情

A 2.5M solution of n-butyllithium in hexane (4.5 ml, 11.3 mmol) was added to a stirred solution of 2-bromo-6-ethoxypyridine (Rec. Trav. chim., 1965, 84, 53; 2.1 g, 11.3 mmol) in anhydrous ether (25 ml), under nitrogen, at about −40° C. After about 20 minutes, tri-n-butyltin chloride (3.1 ml, 11.4 mmol) was slowly added and, after a further 15 minutes, the reaction mixture was allowed to warm to room temperature. The resulting mixture was quenched by the addition of aqueous ammonium chloride solution, then the organic phase separated, washed with water, dried (MgSO4) and evaporated under reduced pressure. The residue was purified by flash chromatography, using an elution gradient of pentane:dichloromethane (100:0 to 80:20), to give the title compound (1.6 g, 34%) as a colourless oil. δ(CDCl3): 0.90 (t,9H), 1.08 (t,6H), 1.30-1.42 (m,9H), 1.58 (m,6H), 4.40 (q,2H), 6.53 (d,1H), 6.97 (d,1H), 7.39 (dd,1H).

1. customThe resulting mixture was quenched by the addition of aqueous ammonium chloride solution
2. customthe organic phase separated
3. washwashed with water
4. dry with materialdried (MgSO4)
5. customevaporated under reduced pressure
6. customThe residue was purified by flash chromatography