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0 °C

To a stirred suspension of NaH (0.016 g of a 60% dispersion in oil, 0.4 mmol) in dry dimethylformamide (1.5 ml) was added 6-Chloro-8-propylpurine (0.044 g, 0.25 mmol) at room temperature. After 20 minutes, the mixture was cooled to 0° C. and N-triphenylmethyl-5-(4'-bromomethylbiphen-2-yl)tetrazole (0.139 g, 0.25 mmol) was added. The resulting mixture was warmed to room temperature and then stirred at 40° C. for 3 hours. The reaction was cooled, and the content of the flask was poured into ice-water (50 ml) and extracted with ethyl acetate (3×15 ml). The combined organic phase was washed with brine and then dried over anhydrous Na2SO4. Removal of the solvent gave the crude product as a foam which was purified by flash-chromatography on silica-gel using ethyl acetate/hexane (1:3). Yield 0.07 g (foam). NMR (CDCl3): δ0.96 (t, J=8 Hz, 3H), 1.806 (m, 2H), 2.75 (m, 2H), 5.35 (s, 2H), 6.85-7.54 (m, 22H), 7.85 (m, 1H), 8.72 (s, 1H). FAB-MS: m/e 674 and 676 (M+H).

1. temperatureThe resulting mixture was warmed to room temperature
2. temperatureThe reaction was cooled
3. extractionextracted with ethyl acetate (3×15 ml)
4. washThe combined organic phase was washed with brine
5. dry with materialdried over anhydrous Na2SO4
6. customRemoval of the solvent