Acetic Acid → HCID 18409471, compound

Participants

Reaction Steps

A mixture of 3,3-dimethyl-1-[(5-(4-(methylsulphonyl)phenyl)-4-phenyl-1H-pyrazol-3-yl)oxy]butan-2-one (145 mg, 0.35 mmol), prepared according to the method of Example 32B, p-toluene-sulfonic acid hydrate (15 mg), and molecular sieves (4 g) in toluene (35 mL) and acetic acid (5 mL) was refluxed for 24 hours. The mixture was concentrated in vacuo, and the residue was purified by chromatography (silica gel, 1:1 hexanes-ethyl acetate) to provide the desired product (yield: 30 mg; 19%). MP 189-191° C.; MS (APCI+) m/z 455 (M+H)+; 1H NMR (300 MHz, DMSO-d6) δ1.22 (s, 9H), 2.48 (s, 3H), 3.28 (s, 3H), 5.37 (s, 2H), 7.23 (m, 5H), 7.60 (d, J=9 Hz, 2H), 7.90 (d, J=9 Hz, 2H); Anal. calc. for C24H26N2O5S.0.5 H2O: C, 62.18; H, 5.87; N, 6.04. Found: C, 62.38; H, 5.81; N, 5.83.

Provenance & Evidence