Cesium carbonate → HCID 57449661, compound

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Reaction Steps

This compound was produced using similar methods as those used in Step 5, example 27, starting with 2-bromo-4-bromomethyl-benzoic acid methyl ester (0.40 g, 1.30 mmol), 4-tert-butyl-benzaldehyde oxime (0.24 g, 1.36 mmol) and cesium carbonate (1.69 g, 5.20 mmol) in acetone (50 mL). The crude material was purified by flash chromatography through silica gel using ethyl acetate/hexanes (0/100 gradient to 6/94) to give 2-bromo-4-[({[(1E)-(4-tert-butylphenyl)methylidene]amino}oxy)methyl]benzoic acid methyl ester (0.43 g, 83%) as a clear, colorless oil. 1H NMR (400 MHz, CDCl3); δ 8.13 (s, 1H), 7.78 (d, 1H), 7.69 (s, 1H), 7.49 (d, 2H), 7.39-7.36 (m, 3H), 5.18 (s, 2H), 3.92 (s, 3H), 1.32 (s, 9H).

Provenance & Evidence