1 Ocak 2016 Dergi makalesi Açık Erişim

Young, Jonathon; Schafer, Christian; Solan, Agnes; Baldrica, Anthony; Belcher, Miranda; Nisanci, Bilal; Wheeler, Kraig A.; Trivedi, Evan R.; Torok, Bela; Dembinski, Roman

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    <subfield code="a">Regioselective "hydroamination" of alk-3-ynones with non-symmetrical o-phenylenediamines. Synthesis of diversely substituted 3H-1,5-benzodiazepines via (Z)-3-amino-2-alkenones</subfield>
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    <subfield code="a">The reaction of alk-3-yn-1-ones (a bifunctional reagent) with o-phenylenediamines provides an effective synthetic method with high atom economy for the preparation of diversely substituted 1,5-3H-benzodiazepines. The reaction initially leads to the formation of conjugated enaminones (3-amino-2alkenones, 51-99%), at room temperature, which constitutes a formal non-catalyzed hydroamination of the non-conjugated alkyne. Non-symmetrical o-phenylenediamines react in a regioselective fashion with respect to amino groups. Both the direct microwave-accelerated reaction of o-phenylenediamines with alkynones in ethanol and the intramolecular cyclization of intermediate enaminones in ethanol/acetic acid lead to substituted 1,5-benzodiazepines with good yields (39-92 and 26-99%). The regio-and stereochemical outcomes of these processes are confirmed by the X-ray structure determination of (Z)-3-[(2-amino-4-methylanilino)-4-(4-methylphenyl)-1-phenylbut-2-en-1-one],4-[(4-methylphenyl) methyl]-7-nitro-2-phenyl-3H-1,5-benzodiazepine and 6,8-dimethyl-4-(4-methylbenzyl)-2-phenyl-3Hbenzo[b][1,5]diazepine.</subfield>
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