4-(4-methylpiperazin-1-yl)-4-oxobutanoic acid → HCID 178462422, compound

Participants

Reaction Steps

A solution of (1R,2R)-2-[[trans-2-[(1E,3E)-4-(4-cyano-2-fluorophenyl)-1,3-butadienyl]-1,3-dioxan-5-yl]thio]-1-(2,4-difluorophenyl)-1-[(1H-1,2,4-triazol-1-yl)methyl]propyl 5-cyano-2-(hydroxymethyl)benzoate (1.38 g, 1.97 mmol) obtained from Example 33 in dichloromethane (40 ml) was cooled to 0° C., and 4-(N,N-dimethylamino)pyridine (481.3 mg, 3.94 mmol), 4-(4-methyl-1-piperazinyl)-4-oxobutanoic acid (described in Bioorg. Med. Chem., 8, 2693 (2000); 708.0 mg, 3.54 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (830.8 mg, 4.33 mmol) were added thereto. The reaction mixture was stirred at the same temperature for 2 hours, and diluted with dichloromethane, then the organic layer was washed successively with water and a saturated aqueous solution of sodium chloride. The solvent was evaporated under reduced pressure, and the obtained residue was subjected to chromatography on a silica gel (30 g) column (eluent; ethyl acetate:methanol=4:1) to afford a mixture of the title compound and 4-(N,N-dimethylamino)pyridine (component ratio; 6:1, 1.33 g). A part (790.8 mg) of the mixture was separated by recycle preparative HPLC [LC-908; Japan Analytical Industry Co., Ltd.; GPC column JAIGEL-1H (20 mm i.d. ×600 mm) and JAIGEL-2H (20 mm i.d. ×600 mm) connected in series for use; solvent, chloroform] to afford the title target compound (763.0 mg, 44% yield) as a colorless amorphous solid.

Provenance & Evidence