反应详情

To a degassed solution of xylene (100 ml) containing 73 (1.82 g, 5.16 mmol), were added 1.25 eq (0.80 ml) of pentane-1-thiol and 1.25 eq of K2CO3 (0.8 g). The resulting mixture was stirred for another 2 hours under N2. Successively were added 10 mol % of Pd2(dba)3 (470 mg) and 20 mol % mmol Xantphos (600 mg). After the addition, the resulting solution was stirred for 18 hours at 130° C. under N2. After cooling to room temperature, the mixture was diluted with ethyl acetate, washed with a saturated NaHCO3 solution, dried (Na2SO4), filtered and concentrated. The resulting residue was purified by flash chromatography (diethyl ether followed by ethyl acetate) to afford 3-[5-pentylsulfanyl-3-(2-trimethylsilanyl-ethoxymethyl)-3H-imidazol-4-yl]-pyridine (74A) as an oil (530 mg, 30%) and starting material (73, 380 mg, 21%), 1H-NMR (400 MHz, CDCl3): δ 9.38 (d, J=2 Hz, 1H), 8.53 (dd, J=5 Hz, 2 Hz, 1H), 8.42 (dt, J=8 Hz, 2 Hz, 1H), 7.82 (s, 1H), 7.35-7.30 (m, 1H), 5.43 (s, 2H), 3.59-3.54 (m, 2H), 2.66 (t, J=7 Hz, 2H), 1.47-1.38 (m, 2H), 1.28-1.10 (m, 4H), 0.96-0.89 (m, 2H), 0.80 (t, J=7 Hz, 3H), 0.0 (s, 9H).

1. additionAfter the addition
2. stirringthe resulting solution was stirred for 18 hours at 130° C. under N2
3. washwashed 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 followed by ethyl acetate)