反应详情

4.1 To a solution of 9-butyl-8-(3-methoxy-benzyl)-9H-purin-6-ylamine (1.24 g, 4 mmol) in AcOH (6 ml) was added N-iodo-succinamide (NIS) (1.8 g, 8 mmol). After 3 h at r.t., additional NIS (1.8 g, 8 mmol) was added, and the mixture was stirred for another 24 h. The reaction mixture was diluted with CH2Cl2 (500 ml), and carefully neutralized with a solution of sat. aq. K2CO3 (2×100 ml), then washed with 0.1 N Na2S2O3 (3×100 ml), brine (3×100 ml), dried (Na2SO4), evaporated, and purified by flash chromatography (CH2Cl2:MeOH=100:5) to give the 9-Butyl-8-(2-iodo-5-methoxy-benzyl)-9H-purin-6-ylamine (4.1), as a colorless powder (0.53 g, 30%); rt=7.7 min.; 1HNMR (CDCl3-d) δ 8.36 (s, 1H), 7.77 (d, J=7.9 Hz, 1H), 6.68 (s, 1H), 6.61 (d, J=7.9 Hz, 1H), 5.62 (s, 2H), 4.33 (s, 2H), 4.06 (t, J=7.7 Hz, 2H), 3.72 (s, 3H), 1.67 (quint., J=7.7 Hz, 2H), 1.36 (sext., J=7.5 Hz, 2H), 0.92 (t, J=7.4 Hz, 3H).

1. washwashed with 0.1 N Na2S2O3 (3×100 ml), brine (3×100 ml)
2. dry with materialdried (Na2SO4)
3. customevaporated
4. custompurified by flash chromatography (CH2Cl2:MeOH=100:5)