反应详情

6-Butyl-2,4-dichloropyrimidine (1.0 g), L-leucine-3-ethoxypropylamide hydrochloride (17 mL of a 0.32 M solution in DMSO), and N,N-diisopropylethylamine (3.0 mL) were stirred for 24 h in 20 mL methyl sulfoxide at 60 C. The solution was cooled to room temperature and diluted with ethyl acetate (100 mL), then washed 4 times with 100 mL aliquots of a saturated aqueous solution of sodium chloride. Silica gel chromatography (gradient: 20–40–50–100% ethyl acetate in hexanes) followed by semi-preparative HPLC purification of mixed fractions provided 1.24 g of 2-(6-butyl-2-chloropyrimidin-4-ylamino)-4-methypentanoic acid (3-ethoxypropyl)amide as a colorless oil.

1. washwashed 4 times with 100 mL aliquots of a saturated aqueous solution of sodium chloride
2. customSilica gel chromatography (gradient: 20–40–50–100% ethyl acetate in hexanes) followed by semi-preparative HPLC purification of mixed fractions