Sodium hydride → [5-Carbamoyl-1-chlorocarbazol-4-yl]oxyacetic acid methyl ester

Participants

Reaction Steps

A solution of 0.28 g of 5-carbamoyl-4-hydroxy-1-chlorocarbazole in 6 ml of tetrahydrofuran was added to 0.043 g of sodium hydride (60% in mineral oil) in 1 ml of tetrahydrofuran and stirred for 60 minutes at room temperature. Methyl bromoacetate (0.11 ml) was then added and the reaction was stirred overnight. The reaction mixture was poured into 20 ml of saturated ammonium chloride solution and then extracted twice with ethyl acetate. The extracts were washed with water and then with brine, dried over magnesium sulfate and concentrated. The residue was chromatographed on silica gel eluting with chloroform and then 2:1 chloroform/ethyl acetate to afford 0.16 g (45%) of the subtitle compound. ESIMS m/e 333 (M++1), 335 (M++3), 331 (M+−1) NMR (300 MHz, d6-DMSO): δ11.73 (s, 1H); 7.56 (d, J=8.1, 1H); 7.50 (br s, 1H); 7.43-7.35 (m, 2H); 7.18 (br s, 1H); 7.06 (d, J=7.8, 1H); 6.56 (d, J=8.6, 1H); 4.90 (s, 2H); 3.70 (s, 3H).

Provenance & Evidence