2-chloro-6-trimethylsilylamino-9-[3,5-di-O-(4-chlorobenzoyl)-2-deoxy-beta-D-ribofurano syl]-purine → Cladribine

Participants

Reaction Conditions

Reaction Steps

To the above prepared mixture of 2-chloro-6-trimethylsilylamino-9-[3,5-di-O-(4-chlorobenzoyl)-2-deoxy-β-D-ribofuranosyl]-purine (IVa) and 2-chloro-6-amino-9-[3,5-di-O-(4-chlorobenzoyl)-2′-deoxy-β-D-ribofuranosyl]-purine (IVb) (179 g, >95.4% HPLC purity) in MeOH (895 mL, 5 P) was added 29% MeONa/MeOH solution (5.25 g, 0.1 eq.) at 20-30° C. The mixture was stirred at 20-30° C. for 6 hours, the solid was filtered, washed with MeOH (60 mL, 0.34 P) and then dried in vacuo at 50° C. for 6 hour to give 72 g white to off-white crude cladribine with 98.9% HPLC purity in ca. 93% yield.

Provenance & Evidence