反应详情

A mixture of [4-(6-chloro-purin-9-yl)phenyl]-acetic acid ethyl ester (182 mg, 0.60 mmol) and Pd/C (10%) in MeOH containing 5% ammonia (15 mL) is stirred for 22 h at rt and under hydrogen (2 bar). The reaction mixture is filtered through a pad of celite and concentrated. The residue is purified by silica gel column chromatography (CH2Cl2/MeOH, 95:5), followed by trituration in Et2O to afford a mixture of (4-purin-9-yl-phenyl)-acetic acid methyl and ethyl ester. This mixture is treated with a 2 N aqueous solution of LiOH (0.5 mL), and THF (1 mL) for 3 h at 50° C. The reaction mixture is allowed to cool to rt and then acidified by addition of 0.5 N HCl aqueous solution. The resulting precipitate is collected by vacuum filtration to provide the title compound as a white solid: ES-MS: 255.1 [M+H]+; tR=1.93 min (System 1).

1. filtrationThe reaction mixture is filtered through a pad of celite
2. concentrationconcentrated
3. customThe residue is purified by silica gel column chromatography (CH2Cl2/MeOH, 95:5)
4. customto afford
5. temperatureto cool to rt
6. filtrationThe resulting precipitate is collected by vacuum filtration