2-Chlorobenzaldehyde → 3-[(2-Chlorophenyl)(hydroxy)methyl]-4-cyano-5-morpholin-4-ylthiophene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A solution of 4-cyano-5-morpholin-4-ylthiophene-2-carboxylic acid (0.1 g, 0.42 mmol) in anhydrous THF (1.5 mL) was cooled down to −70° C. To this cooled solution was added a 2.5 M solution of n-butyl lithium in hexanes (0.672 mL, 1.68 mmol) dropwise under nitrogen. The resulting solution was stirred at −70° C. for 2 h and 2-chlorobenzaldehyde (0.142 mL, 1.26 mmol) was added. The reaction mixture was stirred at −70° C. for a further 2 h and was quenched with water. The mixture was concentrated to a small volume and the aqueous residue was washed with EtOAc. The aqueous solution was separated, acidified with 1N HCl and extracted with EtOAc. The organic solutions were combined, washed with brine, dried over MgSO4, filtered and concentrated. The crude material was purified by column chromatography to give 3-[(2-chlorophenyl)(hydroxy)methyl]-4-cyano-5-morpholin-4-ylthiophene-2-carboxylic acid (61) (0.03 g, 19%). LCMS: (FA) ES+ 319.0. 1H NMR (400 MHz, d6-DMSO) δ: 7.39-7.41 m, 1H), 7.31-7.33 (m, 1H), 7.23-7.27 (m, 2H), 6.19 (s, 1H), 5.74 (s, 1H), 3.70-3.72 m, 4H) and 3.38-3.40 (m, 4H).

Provenance & Evidence