Abstract
Benzyl 2-deoxy-3,5-di-O-p-toluyl- d- erythro-pentofuranosyl thioformimidate 3, prepared from nitrile 1, reacts with α-aminocyanoacetic acid derivatives to yield C-imidazole nucleosides which are further cyclized into purines. The 6-mercapto purine 2 is obtained in two different ways.
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