反应详情

A procedure similar to that described in Preparation 15 was repeated, except that 1.89 g of 2-t-butyl-dimethylsilyloxymethyl-3H-imidazo[5,4-d]pyrimidine (prepared as described in Preparation 49), 0.37 g of sodium hydride (as a 55% by-weight dispersion in mineral oil), 490 μl of methyl iodide and 30 ml of dimethylformamide were used. At the end of this time, the reaction mixture was freed from dimethylformamide by distillation under reduced pressure. The residue thus obtained was treated with 3 N aqueous hydrochloric acid and subsequently made alkaline by the addition of aqueous ammonia. The aqueous mixture was evaporated to dryness, and the resulting residue was purified by column chromatography through silica gel, using a 6:1 by volume mixture of ethyl acetate and ethanol as the eluent, to give 0.37 g of the title compound, melting at 122-125° C.

1. customA procedure similar to that described in Preparation 15
2. distillationAt the end of this time, the reaction mixture was freed from dimethylformamide by distillation under reduced pressure
3. customThe residue thus obtained
4. customThe aqueous mixture was evaporated to dryness
5. customthe resulting residue was purified by column chromatography through silica gel
6. additionby volume mixture of ethyl acetate and ethanol as the eluent