反应详情

A solution of (1S,2R,3S,5R)-3-amino-5-[2-chloro-6-(2,2-diphenyl-ethylamino)-purin-9-yl]-cyclopentane-1,2-diol hydrochloride (an intermediate for preparing Example 22) (100 mg, 0.2 mmol) in dry THF (1 ml) is treated with diisopropylethylamine (0.17 ml, mmol) and cyclobutanecarboxylic acid chloride (0.023 ml, 0.2 mmol) and the mixture is stirred at room temperature for 48 hours. The solvent is removed under reduced pressure. The residue is purified by reverse-phase chromatography eluting with a gradient system of acetonitrile (0.1% TFA): water (0.1% TFA) (0:100 by volume) gradually changing to acetonitrile (0.1% TFA) water (0.1% TFA) (100:0 by volume) to afford the title compound (Slmg). LCMS (electrospray): m/z [MH+] 547.26. 1H nmr (MeOD, 400 MHz); 8.00(s, 1H), 7.40-7.25(m, 8H), 7.20-7.15(m, 2H), 4.70(m, 1H), 4.50(m, 2H), 4.20(m, 2H), 3.95(m, 1H), 2.85(m, 1H), 2.30(m, 2H), 2.20(m, 2H), 2.05(m, 2H), 1.90(m, 1H)

1. customThe solvent is removed under reduced pressure
2. customThe residue is purified by reverse-phase chromatography
3. washeluting with a gradient system of acetonitrile (0.1% TFA)