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We synthesized a series of carbocyclic nucleoside inhibitors of cytidine deaminase (CDA) based on a seven-membered 1,3-diazepin-2-one moiety. In the key step, the seven-membered ring was formed by a ring-closing-metathesis reaction. Therefore, the bis-allyl-urea moiety had to be protected by benzoylation in order to obtain an orientation suitable for ring closure. To our surprise, the analogue built on a flexible sugar template (4) showed a 100-fold stronger inhibition of CDA than the derivative with the preferred south-conformation.

Synthesis of conformationally locked carbocyclic 1,3-diazepinone nucleosides as inhibitors of cytidine deaminase