Potassium Acetate → 3-(4-Hept-1-ynyl-isoxazol-3-yl)-pyridine

Participants

Reaction Conditions

Reaction Steps

To anhydrous DMF (20 ml) containing compound 64 (1.08 g, 4.8 mmol), were added 1.5 eq of hept-1-ynyl-trimethyl-silane (1.21 g), 3 eq of KOAc (1.41 g) and 1 eq of TBAF (1.0 M in THF). The resulting mixture was stirred for another 2 hours under N2. Successively were added 10 mol % of Pd(OAc)2 (108 mg) and 20 mol % of PPH3 (251 mg). After the addition, the resulting solution was warmed at 90° C. for 18 hours under N2. After cooling to room temperature, the mixture was 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-(4-Hept-1-ynyl-isoxazol-3-yl)-pyridine (69A) as an oil (0.34 g, 30%). 1H-NMR (400 MHz, CDCl3): δ 9.3 (d, J=2 Hz, 1H), 8.7 (dd, J=5 Hz, 2 Hz, 1H), 8.58 (s, 1H), 8.34 (dt, J=8 Hz, 2 Hz, 1H), 7.44-7.39 (m, 1H), 2.42 (t, J=7 Hz, 2H), 1.65-1.57 (m, 2H), 1.45-1.29 (m, 4H), 0.91 (t, J=7 Hz, 3H).

Provenance & Evidence