反应详情

温度

10 °C

To anhydrous THF (100 ml) containing 3-bromo-pyridine (3.29 g, 20.82 mmol), were added 1.2 eq of /PrMgCl (12.49 ml, 2M in THF) and the resulting mixture was stirred for 2 hours under N2 (10° C.). Subsequently 1.2 eq of (CH3)3SnCl were added and the reaction mixture was stirred for 18 hours at room temperature (under N2). The reaction mixture was quenched with a saturated NH4Cl solution, diluted with ethyl acetate, washed three times with a saturated NaHCO3 solution, dried (Na2SO4), filtered and concentrated. The resulting residue was purified by flash chromatography (diethyl ether/PE 1/1) to afford 3-trimethylstannanyl-pyridine (71) (3.32 g, 66%). LCMS (method A): Rt: 2.09 min, ([M+H]+=242). 1H-NMR (400 MHz, CDCl3): δ 8.62 (bs, 1H), 8.52 (dd, J=5 Hz, 2 Hz, 1H), 7.76 (dt, J=8 Hz, 2 Hz, 1H), 7.25-7.21 (m, 1H), 0.33 (s, 9H), with Sn satellites at 0.41 and 0.27.

1. customThe reaction mixture was quenched with a saturated NH4Cl solution
2. additiondiluted with ethyl acetate
3. washwashed three times with a saturated NaHCO3 solution
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated
7. customThe resulting residue was purified by flash chromatography (diethyl ether/PE 1/1)