Thiomorpholine → 2-Nitro-5-thiomorpholin-4-yl-4-trifluoromethyl-benzoic acid methyl ester

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Reaction Steps

A solution of 240 mg (0.90 mmol) of 5-fluoro-2-nitro-4-trifluoromethyl-benzoic acid methyl ester and 0.189 ml (2.00 mmol) of thiomorpholine in 2.5 ml of tetrahydrofuran is heated at reflux for 2 hours. After evaporation of the tetrahydrofuran the residue is distributed between water and ethyl acetate, the organic phase separated and washed with water and brine, dried over Na2SO4 and concentrated yielding 310 mg of 2-nitro-5-thiomorpholin-4-yl-4-trifluoromethyl-benzoic acid methyl ester as brown powder, m.p. 68-82° C.

Provenance & Evidence