反应详情

A mixture of 2.5 g of 7-(2,3,5-tri-O-benzyl-β-D-arabinofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine, 5 ml of acetic acid, 500 mg of 20% palladium on charcoal, and 95 ml of methoxyethanol is hydrogenated at 50°-55° C. and approximately 3 atmospheres until uptake of hydrogen ceases. The mixture is filtered, evaporated in vacuo, and coevaporated with xylenes to provide a red syrup which is dissolved in water and treated with Amberlite ion exchange resin (20 ml of wet IR-45). The resin is filtered and washed several times with boiling water. The combined filtrates are evaporated in vacuo to provide 992 mg of crude 7-β-D-arabinofuranosyl-7H-pyrrolo[2,3-d]pyrimidin-4-amine. Recrystallization of this material from water provides 800 mg of product, m.p. 117°-120° C. (after drying at 100° C. for one hour); [α]D25 =+16.2 (1.02% in H2O).

1. customis hydrogenated at 50°-55° C.
2. filtrationThe mixture is filtered
3. customevaporated in vacuo
4. customto provide a red syrup which
5. additiontreated with Amberlite ion exchange resin (20 ml of wet IR-45)
6. filtrationThe resin is filtered
7. washwashed several times with boiling water
8. customThe combined filtrates are evaporated in vacuo