反応 #1340590

反応方程式

6-chloroadenosine

cyclohexylamine

→

N6-cyclohexyladenosine

収率 87.6%

溶媒

ethanol

反応条件

後処理

1. 1
   温度at reflux for 6 hours
2. 2
   濃縮The reaction mixture was concentrated in vacuo
3. 3
   workup.ADDITIONthe resultant residue was diluted with water (50 ml) and ethyl acetate (300 ml)
4. 4
   その他The organic layer was separated
5. 5
   抽出the aqueous layer was extracted with ethyl acetate (2×50 ml)
6. 6
   洗浄The combined organic layers were washed with water (1×30 ml)
7. 7
   乾燥dried over sodium sulfate
8. 8
   濃縮concentrated in vacuo
9. 9
   その他dried under vacuum

実験手順

A solution of 6-chloroadenosine (2.58 g) and cyclohexylamine (5 g) in ethanol (20 ml) was heated at reflux for 6 hours then cooled to room temperature. The reaction mixture was concentrated in vacuo and the resultant residue was diluted with water (50 ml) and ethyl acetate (300 ml). The organic layer was separated and the aqueous layer was extracted with ethyl acetate (2×50 ml). The combined organic layers were washed with water (1×30 ml), dried over sodium sulfate, concentrated in vacuo and dried under vacuum to provide N6-cyclohexyladenosine as a white solid (2.600 g). N6-Cyclohexyladenosine (2.6 g) was diluted with acetone (30 ml) and to the resultant solution was added 2,2-dimethoxypropane (12 ml), followed by D-camphorsulphonic acid (3.01 g) and the mixture was allowed to stir at room temperature for 18 hours. The reaction mixture was concentrated in vacuo and the resultant residue was diluted with ethyl acetate (150 ml), then neutralized to pH 8.0 using saturated aqueous NaHCO3. The organic layer was separated, dried over sodium sulfate, concentrated in vacuo. The residue was purified twice on the silica gel column using MeOH—CH2Cl2 (4:96) as an eluent to provide 2′,3′-isopropylidene-N6-cyclohexyladenosine (3.16 g). 1H NMR (CDCl3): δ 1.23-1.47 (m, 9H), 1.38 (s, 3H), 1.64 (s, 3H), 1.79-1.81 (m, 1H), 2.04-2.06 (m, 1H), 3.80 (d, J=12 Hz, 1H), 3.96 (d, J=12 Hz, 1H), 4.53 (s, 1H), 5.09-5.16 (m, 2H), 5.80-5.92 (m, 2H), 7.79 (s, 1H), 8.24 (s, 1H), 8.22-8.38 (m, 1H).

出典