3-Bromo-1-methylpyrrolidin-2-one → Methyl 3-(4-(5-methyl-1,3,4-oxadiazol-2-yl)phenoxy)-5-(1-methyl-2-oxopyrrolidin-3-yloxy)benzoate

Participants

Reaction Steps

To a stirring solution of Methyl 3-hydroxy-5-[4-(5-methyl-1,3,4-oxadiazol-2-yl)phenoxy]benzoate (4 g) (Intermediate 7) in dry DMF, 3-Bromo-1-methyl-pyrrolidine-2-one (4.12 g) (Intermediate 5) [J. Med. Chem., 1987, 30, 1995-98] was added under nitrogen atmosphere at room temperature in three portions at 4 h interval. The reaction mixture was stirred at room temperature for 16 h and then warmed to 45-50° C. for 3 h. The reaction was monitored by TLC. After completion, reaction mixture was diluted with ice cold water and extracted with EtOAc. All organic layers were combined and washed with water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under vacuum to get crude thick liquid product. Crude residue was chromatographed to yield pure compound (5.2 g).

Provenance & Evidence