Butyl bromide → HCID 178450299, compound

Participants

Reaction Steps

Compound 32C was prepared following the procedure as described for the synthesis of compound 32A (see Scheme 5) using 1-bromo-butane as the alkyl halogenide and 3-pyridin-3-yl-1-(2-trimethylsilanyl-1-ethoxymethyl)-1H-pyrazol-4-ol (30). Work-up and flash chromatography (ethyl acetate/diethyl ether 1/1) afforded compound 31C. Yield 30% (oil). 1H-NMR (major isomer is given, 400 MHz, CDCl3): δ 8.9 (d, J=2 Hz, 1H), 8.6 (dd, J=5 Hz, 2 Hz, 1H), 8.05 (dt, J=8 Hz, 2 Hz, 1H), 7.42 (s, 1H), 7.41-7.37 (m, 1H), 5.37 (s, 2H), 3.98 (t, J=7 Hz, 2H), 3.74-3.68 (m, 2H), 1.74-1.66 (m, 2H), 1.49-1.39 (m, 2H), 0.92 (t, J=7 Hz, 3H), 0.02 (s, 9H).

Provenance & Evidence