Sodium hydride → 4-chloro-2-methylmercapto-7-(2,3,5-tri-O-benzyl-beta-D-arabinofuranosyl)-7H-pyrrolo[2,3-d]pyrimidine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A suspension of 3.1 g sodium hydride, 25.9 g of 4-chloro-2-methylmercapto-7H-pyrrolo[2,3-d]pyrimidine, and 250 ml of dry dimethylformamide (DMF) is stirred at 50° C. for 0.5 hour, cooled, and added to 62.8 g of 2,3,5-tri-O-benzyl-α-D-arabinofuranosyl chloride. The solution is stirred at ambient temperature for 15 hours, concentrated in vacuo, and distributed between a mixture of ethyl acetate and water. Chromatography of the dried (MgSO4) layer over silica gel with 4:1 toluene-ethyl acetate provides 76 g of yellow, syrupy 4-chloro-2-methylmercapto-7-(2,3,5-tri-O-benzyl-β-D-arabinofuranosyl)-7H-pyrrolo[2,3-d]pyrimidine.

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