تفاعل #1340590

معادلة التفاعل

6-chloroadenosine

cyclohexylamine

→

N6-cyclohexyladenosine

المردود 87.6%

المذيبات

ethanol

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةat reflux for 6 hours
2. 2
   تركيزThe 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
   أخرىThe organic layer was separated
5. 5
   استخلاصthe aqueous layer was extracted with ethyl acetate (2×50 ml)
6. 6
   غسيلThe combined organic layers were washed with water (1×30 ml)
7. 7
   تجفيفdried over sodium sulfate
8. 8
   تركيزconcentrated in vacuo
9. 9
   أخرىdried under vacuum

الإجراء التجريبي

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).

المصدر