Triethylamine → 2-{6-[((1R,2R)-2-hydroxycyclopentyl)amino]purin-9-yl}(4S,5S,3R)-5-[(2-fluorophenylthio)methyl]-oxolane-3,4-diol

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반응 단계

To a solution of 2-{6-[((1R,2R)-2-hydroxycyclopentyl)amino]-purin-9-yl}(4S,5S,3R)-5-(chloromethyl)oxolane-3,4-diol (166.5 g, 0.457 mol) and triethylamine distilled from calcium hydride (352 ml, 256 g, 2.53 mol, 4 equivalents) in degassed anhydrous N,N-dimethylformamide (1.8 liters) was added 2-fluorothiophenol (190 ml, 228 g, 1.78 mol, 4 equiv) in 38 5 ml portions every 2-3 hours. The mixture was stirred at room temperature for 4 days with continuous bubbling of nitrogen into the solution (the reaction was monitored by 1H NMR). After the reaction was complete, the reaction mixture was poured into 7 liters of ethyl acetate, which was washed with 3 liters of water. The aqueous layer extracted with ethyl acetate (2×500 ml), and the combined organic layers were washed with water (3×2 liters), then reduced to a volume of about 1.8 liters, providing a suspension of a white solid. The suspension was stirred for 9 hours at room temperature, and the white precipitate filtered off, washed with diethyl ether (3×200 ml), and dried for 24 hours under high vacuum to give 131 g (63% yield) of 2-{6-[((1R,2R)-2-hydroxycyclopentyl)amino]purin-9-yl}(4S,5S,3R)-5-[(2-fluorophenylthio)methyl]-oxolane-3,4-diol as a white powder (98.9% pure).

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