Water → HCID 178458514, compound

Participants

Reaction Steps

The compound (140 mg, 0.41 mmol) of example 42 was suspended in a mixed solution of water (2.5 ml) and acetic acid (2.5 ml), added with S-methylisothiourea (64 mg, 0.45 mmol), and heated to reflux under stirring for 10 h. The reaction mixture was concentrated to dryness, dissolved in dichloromethane (20 ml), and washed orderly with 1N NaOH (5 ml), water (10 ml) and saturated saline. The organic phase was dried with anhydrous Na2SO4 and concentrated under reduced pressure to give an oil, which was passed through a silica gel column using ethyl acetate-petroleum ether as an eluant to obtain the title compound (35 mg, yield: 25%). 1H NMR (CDCl3) δ: 8.26 (1H, d), 8.00 (1H, dd), 7.50 (1H, br), 6.99 (1H, d), 4.14 (2H, t), 2.67 (2H, q), 2.59 (2H, q), 1.97 (2H, m), 1.29 (3H, t), 1.15 (3H, t), 1.13 (3H, t).

Provenance & Evidence