反应详情

To a mixture of the HCl-salt of 2-[1-(4-bromophenyl)-cyclopentyl]-acetamidine (229) (6.5 g, 20.47 mmol) and (E)-2-benzyloxy-3-hydroxy-but-2-enedioic acid 4-tert-butyl ester 1-methyl ester (4) (9.47 g, 30.71 mmol) in methanol (100 mL) was added sodium methoxide (3.32 g, 23.73 mmol, 25% in methanol) at 0° C. Then the reaction mixture was allowed to warm to room temperature and was stirred for 16 h. After completion of the reaction, solvent was reduced and the crude product was dissolved in dichloromethane (150 mL). The organic part was washed with 1N HCl, separated and dried over Na2SO4. After evaporation, the crude product was purified by 100-200 silica gel column chromatography using 20% ethyl acetate in hexane as the eluent to give 5-benzyloxy-2-[1-(4-bromophenyl)-cyclopentylmethyl]-6-hydroxypyrimidine-4-carboxylic acid tert-butyl ester (230) (7.9 g, 71%) as a yellow solid.

1. customAfter completion of the reaction, solvent
2. washThe organic part was washed with 1N HCl
3. customseparated
4. dry with materialdried over Na2SO4
5. customAfter evaporation
6. customthe crude product was purified by 100-200 silica gel column chromatography