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Seven- and 10-membered cyclic thioenamino peptides, that is, 1,4-thiazepinone (11) and cyclic thioenamino peptide 9 (which represents a potential γ-turn mimetic), were synthesized, and the structure of 11 was secured by X-ray diffraction analysis of its TFA salt. The aforementioned compounds were prepared in solution and by solid-phase synthesis. Additionally, we have prepared thioenamino diketopiperazine...
Asmarines are marine alkaloids with the unique N(10)-hydroxytetrahydro[1,4] diazepino[1,2,3-g,h]purine system and interesting biological activity. The heterotricyclic system was prepared from substituted purines. CH-correlations were found to be an easy way to determine the mode of cyclisation in those cases where more than one is possible, that is, obtaining the tetrahydrodiazepinopurine or tetrahydropyrimidopurine...
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