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。
Palladium Catalysed Cross-Coupling Reaction with Indolylborate: A Concise Access to Ellipticine Derivatives
作者:Minoru Ishikura、Toshikatsu Yaginuma、Isao Agata、Yoshihisa Miwa、Reiko Yanada、Tooru Taga
DOI:10.1055/s-1997-746
日期:1997.2
A novel approach to ellipticine derivatives is described. The palladium catalysed cross-coupling reaction of indolylborate 1 with vinylbromides 4 gives hexatrienes 5, which are subsequently converted to pyrido[4,3-b]carbazoles. In addition, the acid promoted spiroannelation reaction of hexatrienes 5 is observed to give spiroindoles 9.
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.
The palladium catalyzedtandem cyclization–cross-coupling reaction of indolylborate (2) with vinyl bromide (9) was developed for the preparation of pyrido[4,3-b]carbazole as a key reaction. The cross-coupling reaction of 2a provided hexatriene (10), and then cyclization of 10 to pyrido[4,3-b]carbazole (12) was effected with irradiation or Lewisacid. Using indolylborate (2c) for the cross-coupling
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。