2-allyloxy-6-{(di-n-butylaminomethylidene)amino}-9-[2-deoxy-β-D-erythro-pentofuranosyl]-9H-purine 、
4,4'-双甲氧基三苯甲基氯 在
吡啶 作用下,
反应 4.0h,
以78%的产率得到2-allyloxy-6-{(di-n-butylaminomethylidene)amino}-9-[2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-erythro-pentofuranosyl]-9H-purine