Potassium Phosphate, Tribasic → 3-(1-phenylsulfonyl-4-hex-1-enyl-1H-pyrazol-3-yl)-pyridine

Participants

Reaction Conditions

Reaction Steps

To toluene (20 ml) containing 36A (0.67 g, 1.84 mmol) (see Scheme 7), was added 1.5 eq of (E)-hexene-1-ylboronic acid (0.35 g). The resulting mixture was stirred for 2 hours under N2. Successively were added 2 eq of K3PO4 (0.78 g), 4 mol % of Pd(OAc)2 (16.5 mg) and 8 mol % of S-Phos (60.4 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-(1-phenylsulfonyl-4-hex-1-enyl-1H-pyrazol-3-yl)-pyridine (46A) as an oil (0.38 g, 61%). 1H-NMR (400 MHz, CDCl3): δ 8.8 (d, J=2 Hz, 1H), 8.6 (dd, J=5 Hz, 2 Hz, 1H), 8.15 (s, 1H), 8.10-8.05 (m, 2H), 7.94 (dt, J=8 Hz, 2 Hz, 1H), 7.70-7.64 (m, 1H), 7.56 (bt, J=8 Hz, 2H), 7.37-7.33 (m, 1H), 6.19-6.02 (m, 1H), 2.2-2.13 (m, 2H), 1.45-1.29 (m, 4H), 0.90 (t, J=7 Hz, 3H).

Provenance & Evidence