1-(2-deoxy-β-D-erythro-pentofuranosyl)-1,5-dihydro-6-[(2-methylpropanoyl)amino]-3-(3-trifluoroacetamidoprop-yl)-4H-pyrazolo[3,4-d]-pyrimidin-4-one 、
4,4'-双甲氧基三苯甲基氯 在
吡啶 作用下,
以65.4%的产率得到1-[2-deoxy-5-O-(4,4'-dimethoxytriphenylmethyl)-β-D-erythro-pentofuranosyl]-1,5-dihydro-6-[(2-methylpropanoyl)amino]-3-(3-trifluoroacetamidoprop-yl)-4H-pyrazolo[3,4-d]-pyrimidin-4-one