开发了吲哚硼酸酯(2)与乙烯基溴(9)的钯催化串联环化-交叉偶联反应,用于制备吡啶并[4,3- b ]咔唑。2a的交叉偶联反应提供了己三烯(10),然后用辐射或路易斯酸将10环化为吡啶并[4,3- b ]咔唑(12)。使用吲哚硼酸酯(2c)进行交叉偶联反应,通过相似的反应序列获得了玫瑰树碱的新型结构。
开发了吲哚硼酸酯(2)与乙烯基溴(9)的钯催化串联环化-交叉偶联反应,用于制备吡啶并[4,3- b ]咔唑。2a的交叉偶联反应提供了己三烯(10),然后用辐射或路易斯酸将10环化为吡啶并[4,3- b ]咔唑(12)。使用吲哚硼酸酯(2c)进行交叉偶联反应,通过相似的反应序列获得了玫瑰树碱的新型结构。
Concisesyntheses of 9-methoxyellipticine, 3,4-dihydroellipticine (µ-alkaloid D), 1,2,3,4-tetrahydroellipticine, 2-methyl-1,2,3,4-tetrahydroellipticine, olivacine, 3,4-dihydroolivacine, (±)-guatambuine, and (±)-janetine were developed starting from hexatriene intermediates readily obtained by Pd-catalyzed tandem cyclization/cross-coupling reaction of indolylborates. The route enables the facile construction
known about the biological activities of these compounds. Six synthetic natural alkaloids and five of their derivatives were evaluated for their antiproliferative activity against HCT-116 and HL-60 cells. The activities of variants with the D-reduced ring or without the C(11)-Me group were lower than those of ellipticine. The conformer of guatambuine showed higher activities than guatambuine.
A total synthesis of ellipticine could be attained through the palladium catalyzed tandem cyclization-cross-coupling reaction of indolylborate (2 b) with vinyl bromide (3) as a key reaction.