Synthesis and Cytostatic Activities of New 6-Substituted Purinylcarbonucleosides Derived from Indan

A new series of 6-substituted purinylcarbonucleosides derivatives of indan, 8a-g and 10a-d, was synthesized from (±)-cis-1,3-indandimethanol acetate (5), which was prepared in three steps from benzonorbornadiene. 6-Chloropurine was introduced both by Mitsunobu reaction with 5 and by substitution of the mesylate 6. Suzuki-Miyaura reactions of the protected 6-chloropurine derivative 7 with substituted phenylboronic acids afforded 9a-d (protected purine derivatives with substituted phenyl rings at position 6); deprotection of the latter yielded the new series of purinylcarbonucleoside indan derivatives 10a-d. Treatment of compound 7 with R′H/NaOH afforded a parallel series 8a-g, with alkoxy or amino groups R′ at position 6 instead of substituted phenyl rings.