反应详情

温度

0 °C

To a stirred solution of 2-[1-(4-chlorophenyl)-cyclopentyl]-acetamidine; hydrochloride (322) (3.1 g, 11.34 mmol) in methanol (25 mL) was added (E,Z)-2-benzyloxy-3-hydroxy-but-2-enedioic acid 4-tert-butyl ester 1-methyl ester (4) (4.19 g, 13.61 mmol) and cooled to 0° C. To this reaction mixture was then added sodium methoxide (25% in methanol) (7.4 mL, 34.03 mmol) and stirred at room temperature for 16 h (TLC; ethyl acetate:hexane=1:1, Rf=0.5). The reaction mixture was diluted with ethyl acetate (300 mL), washed with water (60 mL) and brine (60 mL) and dried and concentrated in vacuo to get crude mass which was purified by CombiFlash eluted with gradient polarity mobile phase (hexane to 50% ethyl acetate in hexane) to get pure 5-benzyloxy-2-[1-(4-chlorophenyl)-cyclopentylmethyl]-6-hydroxypyrimidine-4-carboxylic acid tert-butyl ester (323) (5.1 g, 91%) as a light brown solid.

1. washwashed with water (60 mL) and brine (60 mL)
2. customdried
3. concentrationconcentrated in vacuo
4. customto get crude mass which
5. customwas purified by CombiFlash
6. washeluted with gradient polarity mobile phase (hexane to 50% ethyl acetate in hexane)