Sodium hydride → HCID 10970223, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of sodium hydride (60% in mineral oil, 2.88 g, 72 mmol) in anhydrous DMSO (100 ml) after stirring at 65° C. for 1.5 h under nitrogen was changed to a clear solution, which was cooled to room temperature and transferred to a cold, stirred suspension of methyltriphenylphosphonium bromide (27.0 g, 75.6 mmol) in DMSO (20 ml) under nitrogen. The reaction mixture was stirred at room temperature for 45 min. and a solution of 3′-O-t-butyldimethylsilyl-5′-formylthymidine (8.50 g, 24 mmol) in DMSO (40 ml) added with cooling. The reaction mixture was stirred at room temperature for 2 h, diluted with ethyl acetate (2 L), washed with brine (5×800 ml), dried (Na2SO4), concentrated. The crude was purified by chromatography on silica (EtOAc-hexane, 30:70) to give 6.79 g (80.2%) of 3′-O-t-butyldimethylsilyl-5′-deoxy-5′-methylidene-thymidine as a colorless solid, m.p. 122° (recrystalization from ethyl acetate and hexane).

Provenance & Evidence