Sodium Bicarbonate → HCID 53927366, compound

Participants

Reaction Steps

A solution of NaClO2 (2.8 mmol) in 3 mL water was added dropwise to a stirred solution of 5-[(N-benzyloxycarbonyl-L-valyloxy)methyl]-2-furaldehyde (798 mg, 2.22 mmol) from step (a) in 3 mL MeCN, with cooling in an ice bath. After 2.5 h, the ice bath was removed, 2 mL more MeCN was added, and the two-phase liquid reaction mixture was stirred at room temperature for 25 h. The reaction mixture was diluted with water, made basic with saturated NaHCO3, and extracted with ethyl acetate (3×50 mL). The separated aqueous solution was acidified to pH 2 with 5% aqueous HCl and extracted with ethyl acetate (3×50 mL). This second ethyl acetate solution was washed with brine, dried over anhydrous Na2SO4, and evaporated to dryness under vacuum to give the carboxylic acid (287 mg, 34%) which was used in the next step without further purification. The compound can be activated and esterified direct to a drug or further modified as described below.

Provenance & Evidence